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6.09k
| versions
list | update_date
timestamp[s] | authors_parsed
list |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
quant-ph/9907034
|
A. Heidmann
|
A. Heidmann, P.F. Cohadon, M. Pinard
|
Thermal noise of a plano-convex mirror
|
5 pages, 5 figures, RevTeX
|
Phys.Lett. A263 (1999) 27-32
|
10.1016/S0375-9601(99)00704-5
| null |
quant-ph
| null |
We study theoretically the internal thermal noise of a mirror coated on a
plano-convex substrate. The comparison with a cylindrical mirror of the same
mass shows that the effect on a light beam can be reduced by a factor 10,
improving the sensitivity of high-precision optical experiments such as
gravitational-wave interferometers.
|
[
{
"version": "v1",
"created": "Fri, 9 Jul 1999 13:10:16 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Feb 2000 17:21:58 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Heidmann",
"A.",
""
],
[
"Cohadon",
"P. F.",
""
],
[
"Pinard",
"M.",
""
]
] |
quant-ph/9907035
|
Paul Vitanyi
|
Paul Vitanyi (CWI & University of Amsterdam)
|
Three Approaches to the Quantitative Definition of Information in an
Individual Pure Quantum State
|
8 pages, LaTeX
|
In: Proc. 15th IEEE Conf. Computational Complexity, 2000
| null | null |
quant-ph
| null |
In analogy of classical Kolmogorov complexity we develop a theory of the
algorithmic information in bits contained in any one of continuously many pure
quantum states: quantum Kolmogorov complexity. Classical Kolmogorov complexity
coincides with the new quantum Kolmogorov complexity restricted to the
classical domain. Quantum Kolmogorov complexity is upper bounded and can be
effectively approximated from above. With high probability a quantum object is
incompressible. There are two alternative approaches possible: to define the
complexity as the length of the shortest qubit program that effectively
describes the object, and to use classical descriptions with computable real
parameters.
|
[
{
"version": "v1",
"created": "Fri, 9 Jul 1999 14:02:18 GMT"
},
{
"version": "v2",
"created": "Thu, 22 Jul 1999 16:04:08 GMT"
},
{
"version": "v3",
"created": "Thu, 4 May 2000 16:27:41 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Vitanyi",
"Paul",
"",
"CWI & University of Amsterdam"
]
] |
quant-ph/9907036
|
Daniel R. Terno
|
Tal Mor and Daniel R. Terno
|
Sufficient conditions for a disentanglement
|
3 pages, REVTEX, no figures
|
Phys.Rev.A60:4341,1999
|
10.1103/PhysRevA.60.4341
| null |
quant-ph
| null |
We consider a disentanglement process in which local properties of an
entangled state are preserved, while the entanglement between the subsystems is
erased. Sufficient conditions for a perfect disentanglement (into product
states and into separable states) are derived, and connections to the
conditions for perfect cloning and for perfect broadcasting are observed.
|
[
{
"version": "v1",
"created": "Fri, 9 Jul 1999 16:19:31 GMT"
}
] | 2008-12-18T00:00:00 |
[
[
"Mor",
"Tal",
""
],
[
"Terno",
"Daniel R.",
""
]
] |
quant-ph/9907037
|
Yeranuhi Hakobyan
|
E. G. Kalnins, W. Miller Jr, Ye. M. Hakobyan, G. S. Pogosyan
|
Superintegrability on the two dimensional hyperboloid II
|
18 pages, LaTex; 1 figure (eps)
|
J.Math.Phys. 40 (1999) 2291-2306
|
10.1063/1.532864
|
Preprint JINR E2-98-229
|
quant-ph hep-th math-ph math.MP
| null |
This work is devoted to the investigation of the quantum mechanical systems
on the two dimensional hyperboloid which admit separation of variables in at
least two coordinate systems. Here we consider two potentials introduced in a
paper of C.P.Boyer, E.G.Kalnins and P.Winternitz, which haven't yet been
studied. We give an example of an interbasis expansion and work out the
structure of the quadratic algebra generated by the integrals of motion.
|
[
{
"version": "v1",
"created": "Fri, 9 Jul 1999 19:51:17 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Kalnins",
"E. G.",
""
],
[
"Miller",
"W.",
"Jr"
],
[
"Hakobyan",
"Ye. M.",
""
],
[
"Pogosyan",
"G. S.",
""
]
] |
quant-ph/9907038
|
Mladen Pavicic
|
Mladen Pavicic
|
Event-ready entanglement preparation
|
10 pages, LaTeX, 4 figures, Author's URL http://m3k.grad.hr/pavicic
|
in "Quantum Interferometry," Proceedings of the Adriatico
Workshop, Trieste, March 1996. F. De Martini, G. Denardo, and Y. Shih (eds.),
(VCH, New York, 1996), pp. 193-204
| null | null |
quant-ph
| null |
We present an experiment which prepare entanglement between photons that
nowhere interacted and whose paths nowhere crossed. The experiment puts
together two photons from two (non-maximal) singlet-like photon pairs and make
them interfere at an asymmetrical beam splitter. As a result one finds
polarization correlations between the other companion photons from the pairs
whose paths nowhere crossed each other even when no polarization measurements
have been carried out on the former photons. The latter set of photons that
nowhere interacted are therefore event-ready prepared by their pair-companion
photons. The result reveals nonlocality as a property of selection which can
even be a preselection. It also reveals that one can predict spin-correlated
behaviour of photons in space and at beam splitters by controlling a no-spin
observable. [From the Book of Abstracts as appeared at the Workshop.]
|
[
{
"version": "v1",
"created": "Fri, 9 Jul 1999 21:06:48 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Pavicic",
"Mladen",
""
]
] |
quant-ph/9907039
|
Mladen Pavicic
|
Mladen Pavicic
|
A method for reaching detection efficiencies necessary for optical
loophole-free Bell experiments
|
RevTeX, 20 pages, 2figures, Author's URL http://m3k.grad.hr/pavicic
|
Opt.Commun. 142 (1997) 308-314
|
10.1016/S0030-4018(97)00285-X
| null |
quant-ph
| null |
A method for preparing a loophole-free four-photon Bell experiments which
requires a detection efficiency of 67% is proposed. It enables realistic
detection efficiencies of 75% at a visibility of 85%. Two type-II crystals each
down convert one correlated photon pair and we entangle one photon from one
pair with one photon from the other pair on a highly transparent beam splitter.
The entanglement selects two other conjugate photons into a Bell state. Wide
solid angles for the conjugate photons then enable us to collect close to 100%
of them. The cases when both photon pairs come from only one of the two
crystals are successfully taken into account. Hardy's equalities are discussed.
|
[
{
"version": "v1",
"created": "Fri, 9 Jul 1999 22:22:45 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Pavicic",
"Mladen",
""
]
] |
quant-ph/9907040
|
Mladen Pavicic
|
Mladen Pavicic
|
Resonance energy-exchange-free detection and "welcher Weg" experiment
|
RevTeX, 14 pages, 3 figures, see http://m3k.grad.hr/pavicic for
Author's web site
|
Phys.Lett. A223 (1996) 241-245
|
10.1016/S0375-9601(96)00751-7
| null |
quant-ph
| null |
It is shown that a monolithic total-internal-reflection resonator can be used
for energy-exchange-free detections of objects without recoils. Related
energy-exchange-free detection of "welcher Weg" is discussed and an experiment
with an atom interferometer is proposed. The obtained results are in agreement
with quantum theory.
|
[
{
"version": "v1",
"created": "Fri, 9 Jul 1999 23:31:00 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Pavicic",
"Mladen",
""
]
] |
quant-ph/9907041
|
Jinhyoung Lee
|
Jinhyoung Lee and M. S. Kim
|
Entanglement Teleportation via Werner States
|
4pages, 3figures
|
Phys.Rev.Lett.84:4236,2000
|
10.1103/PhysRevLett.84.4236
| null |
quant-ph
| null |
Transfer of entanglement and information is studied for quantum teleportation
of an unknown entangled state through noisy quantum channels. We find that the
quantum entanglement of the unknown state can be lost during the teleportation
even when the channel is quantum correlated. We introduce a fundamental
parameter of correlation information which dissipates linearly during the
teleportation through the noisy channel. Analyzing the transfer of correlation
information, we show that the purity of the initial state is important in
determining the entanglement of the replica state.
|
[
{
"version": "v1",
"created": "Sat, 10 Jul 1999 06:33:41 GMT"
},
{
"version": "v2",
"created": "Fri, 25 Feb 2000 09:02:55 GMT"
}
] | 2009-01-23T00:00:00 |
[
[
"Lee",
"Jinhyoung",
""
],
[
"Kim",
"M. S.",
""
]
] |
quant-ph/9907042
|
Dominik Janzing
|
Dominik Janzing and Thomas Beth
|
Fragility of a class of highly entangled states of many quantum-bits
|
9 Pages, RevTex
|
Phys.Rev.A61:052308,2000
|
10.1103/PhysRevA.61.052308
| null |
quant-ph
| null |
We consider a Quantum Computer with n quantum-bits (`qubits'), where each
qubit is coupled independently to an environment affecting the state in a
dephasing or depolarizing way. For mixed states we suggest a quantification for
the property of showing {\it quantum} uncertainty on the macroscopic level. We
illustrate in which sense a large parameter can be seen as an indicator for
large entanglement and give hypersurfaces enclosing the set of separable
states. Using methods of the classical theory of maximum likelihood estimation
we prove that this parameter is decreasing with 1/\sqrt{n} for all those states
which have been exposed to the environment.
Furthermore we consider a Quantum Computer with perfect 1-qubit gates and
2-qubit gates with depolarizing error and show that any state which can be
obtained from a separable initial state lies inbetween a family of pairs of
certain hypersurfaces parallel to those enclosing the separable ones.
|
[
{
"version": "v1",
"created": "Sat, 10 Jul 1999 13:04:40 GMT"
}
] | 2008-12-18T00:00:00 |
[
[
"Janzing",
"Dominik",
""
],
[
"Beth",
"Thomas",
""
]
] |
quant-ph/9907043
|
Radu Ionicioiu
|
Radu Ionicioiu, Gehan Amaratunga, Florin Udrea (University of
Cambridge, UK)
|
Ballistic Single-Electron Quputer
|
5 pages, LaTeX, 3 figures, uses epsf
| null | null | null |
quant-ph cond-mat
| null |
We propose a new solid state implementation of a quantum computer (quputer)
using ballistic single electrons as flying qubits in 1D nanowires. We use a
single electron pump (SEP) to prepare the initial state and a single electron
transistor (SET) to measure the final state. Single qubit gates are implemented
using quantum dots as phase shifters and electron waveguide couplers as beam
splitters. A Coulomb coupler acts as a 2-qubit gate, using a mutual phase
modulation effect. Since the electron phase coherence length in GaAs/AlGaAs
heterostructures is of the order of 30$\mu$m, several gates (tens) can be
implemented before the system decoheres.
|
[
{
"version": "v1",
"created": "Sun, 11 Jul 1999 00:25:54 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Ionicioiu",
"Radu",
"",
"University of\n Cambridge, UK"
],
[
"Amaratunga",
"Gehan",
"",
"University of\n Cambridge, UK"
],
[
"Udrea",
"Florin",
"",
"University of\n Cambridge, UK"
]
] |
quant-ph/9907044
|
Gov Shahar
|
S. Gov (1), S. Shtrikman (1+2), H. Thomas (3) ((1) The Dept. of
Electronics, Weizmann Institute of Science, Rehovot, Israel (2) The Dept. of
Physics, University of California, San Diego, CA, USA (3) The Department of
Physics and Astronomy, University of Basel, Basel, Switzerland)
|
Magnetic trapping of neutral particles: Classical and Quantum-mechanical
study of a Ioffe-Pritchard type trap
|
25 pages + 1 EPS figure
| null |
10.1063/1.372444
| null |
quant-ph
| null |
Recently, we developed a method for calculating the lifetime of a particle
inside a magnetic trap with respect to spin flips, as a first step in our
efforts to understand the quantum-mechanics of magnetic traps. The 1D toy model
that was used in this study was physically unrealistic because the magnetic
field was not curl-free. Here, we study, both classically and
quantum-mechanically, the problem of a neutral particle with spin S, mass m and
magnetic moment mu, moving in 3D in an inhomogeneous magnetic field
corresponding to traps of the Ioffe-Pritchard, `clover-leaf' and `baseball'
type. Defining by omega_p, omega_z and omega_r the precessional, the axial and
the lateral vibrational frequencies, respectively, of the particle in the
adiabatic potential, we find classically the region in the $(\omega_{r}%
(omega_r -- omega_z) plane where the particle is trapped.
Quantum-mechanically, we study the problem of a spin-one particle in the same
field. Treating omega_r / omega_p and omega_z / omega_p as small parameters for
the perturbation from the adiabatic Hamiltonian, we derive a closed-form
expression for the transition rate 1/T_{esc} of the particle from its trapped
ground-state. We find that in the extreme cases, the expression for 1/T_{esc}
is dominated by the largest of the two frequencies omega_r and omega_z.
|
[
{
"version": "v1",
"created": "Mon, 12 Jul 1999 06:47:56 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Gov",
"S.",
"",
"1+2"
],
[
"Shtrikman",
"S.",
"",
"1+2"
],
[
"Thomas",
"H.",
""
]
] |
quant-ph/9907045
|
Krutitsky
|
K.V.Krutitsky, F.Burgbacher and J.Audretsch
|
Microscopic theory of the interaction of ultracold dense Bose and Fermi
gases with electromagnetic field
|
6 pages, RevTeX, invited talk at the 8TH International Workshop on
Laser Physics
|
Laser Physics 10(1), 15-20 (2000)
| null | null |
quant-ph
| null |
We present the rigorous microscopic quantum theory of the interaction of
ultracold Bose and Fermi gases with the electromagnetic field of vacuum and
laser photons. The main attention has been paid to the consistent consideration
of dynamical dipole-dipole interactions. The theory developed is shown to be
consistent with the general principles of the canonical quantization of
electromagnetic field in a medium. Starting from the first principles of QED we
have derived the general system of Maxwell-Bloch equations for atomic creation
and annihilation operators and the propagation equation for the laser field
which can be used for the self-consistent analysis of various linear and
nonlinear phenomena in atom optics at high densities of the atomic system. All
known equations which are used for the description of the behaviour of an
ultracold atomic ensemble in a radiation field can be obtained from our general
system of equations in a low-density limit.
|
[
{
"version": "v1",
"created": "Mon, 12 Jul 1999 07:48:56 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Krutitsky",
"K. V.",
""
],
[
"Burgbacher",
"F.",
""
],
[
"Audretsch",
"J.",
""
]
] |
quant-ph/9907046
|
Antonio Vidiella-Barranco
|
H. Moya-Cessa, S.M. Dutra, A. Vidiella-Barranco and J.A. Roversi
(Universidade Estadual de Campinas, Brazil)
|
Quantum state reconstruction in the presence of dissipation
| null |
J.Mod.Opt. 46 (1999) 555
|
10.1080/09500349908231283
| null |
quant-ph
| null |
We propose a realistic scheme to determine the quantum state of a single mode
cavity field even after it has started to decay due to the coupling with an
environment. Although dissipation destroys quantum coherences, we show that at
zero temperature enough information about the initial state remains, in an
observable quantity, to allow the reconstruction of its Wigner function.
|
[
{
"version": "v1",
"created": "Mon, 12 Jul 1999 17:45:36 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Moya-Cessa",
"H.",
"",
"Universidade Estadual de Campinas, Brazil"
],
[
"Dutra",
"S. M.",
"",
"Universidade Estadual de Campinas, Brazil"
],
[
"Vidiella-Barranco",
"A.",
"",
"Universidade Estadual de Campinas, Brazil"
],
[
"Roversi",
"J. A.",
"",
"Universidade Estadual de Campinas, Brazil"
]
] |
quant-ph/9907047
|
William K. Wootters
|
Valerie Coffman, Joydip Kundu, and William K. Wootters
|
Distributed Entanglement
|
13 pages LaTeX; references added, derivation of Eq. (11) simplified
|
Phys.Rev.A61:052306,2000
|
10.1103/PhysRevA.61.052306
| null |
quant-ph
| null |
Consider three qubits A, B, and C which may be entangled with each other. We
show that there is a trade-off between A's entanglement with B and its
entanglement with C. This relation is expressed in terms of a measure of
entanglement called the "tangle," which is related to the entanglement of
formation. Specifically, we show that the tangle between A and B, plus the
tangle between A and C, cannot be greater than the tangle between A and the
pair BC. This inequality is as strong as it could be, in the sense that for any
values of the tangles satisfying the corresponding equality, one can find a
quantum state consistent with those values. Further exploration of this result
leads to a definition of the "three-way tangle" of the system, which is
invariant under permutations of the qubits.
|
[
{
"version": "v1",
"created": "Tue, 13 Jul 1999 07:38:38 GMT"
},
{
"version": "v2",
"created": "Sat, 24 Jul 1999 07:01:01 GMT"
}
] | 2008-12-18T00:00:00 |
[
[
"Coffman",
"Valerie",
""
],
[
"Kundu",
"Joydip",
""
],
[
"Wootters",
"William K.",
""
]
] |
quant-ph/9907048
|
Tomas Opatrny
|
T. Opatrny, G. Kurizki, and D.-G. Welsch
|
Continuous-variable teleportation improvement by photon subtraction via
conditional measurement
|
7 pages REVTeX, 7 figures
|
Phys.Rev. A61 (2000) 032302
|
10.1103/PhysRevA.61.032302
| null |
quant-ph
| null |
We show that the recently proposed scheme of teleportation of continuous
variables [S.L. Braunstein and H.J. Kimble, Phys. Rev. Lett. 80, 869 (1998)]
can be improved by a conditional measurement in the preparation of the
entangled state shared by the sender and the recipient. The conditional
measurement subtracts photons from the original entangled two-mode squeezed
vacuum, by transmitting each mode through a low-reflectivity beam splitter and
performing a joint photon-number measurement on the reflected beams. In this
way the degree of entanglement of the shared state is increased and so is the
fidelity of the teleported state.
|
[
{
"version": "v1",
"created": "Tue, 13 Jul 1999 13:28:28 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Opatrny",
"T.",
""
],
[
"Kurizki",
"G.",
""
],
[
"Welsch",
"D. -G.",
""
]
] |
quant-ph/9907049
|
Andrew Scott Parkins
|
A.S. Parkins, H.J. Kimble
|
A position-momentum EPR state of distantly-separated trapped atoms
|
5 pages, 2 figures, submitted to Phys. Rev. A
| null |
10.1103/PhysRevA.61.052104
| null |
quant-ph
| null |
We propose a scheme for preparing an EPR state in position and momentum of a
pair of distantly-separated trapped atoms. The scheme utilizes the entangled
light fields output from a nondegenerate optical parametric amplifier. Quantum
state exchange between these fields and the motional states of the trapped
atoms is accomplished via interactions in cavity QED.
|
[
{
"version": "v1",
"created": "Tue, 13 Jul 1999 22:07:36 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Parkins",
"A. S.",
""
],
[
"Kimble",
"H. J.",
""
]
] |
quant-ph/9907050
|
Ghirardi Giancarlo,
|
Angelo Bassi, GianCarlo Ghirardi
|
More about Dynamical Reduction and the Enumeration Principle
|
23 pages, Latex, to appear in Brit. J. Phil. Sci
|
Brit. Journ. Phil. Sci. 50, 719 (1999).
| null | null |
quant-ph
| null |
In view of the arguments put forward by Clifton and Monton [1999] in a recent
preprint, we reconsider the alleged conflict of dynamical reduction models with
the enumeration principle. We prove that our original analysis of such a
problem is correct, that the GRW model does not meet any difficulty and that
the reasoning of the above authors is inappropriate since it does not take into
account the correct interpretation of the dynamical reduction theories.
|
[
{
"version": "v1",
"created": "Wed, 14 Jul 1999 15:13:17 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Bassi",
"Angelo",
""
],
[
"Ghirardi",
"GianCarlo",
""
]
] |
quant-ph/9907051
| null |
B. Carazza (Dipartimento di Fisica, Parma, Italy)
|
Decoherence within a simple Model for the Environment
|
13 pages, LaTex, no figures. To appear on Found. Phys. Letts
|
Found.Phys.Lett. 12 (1999) 485-495
| null | null |
quant-ph
| null |
This article examines the decoherence of a macroscopic body using a simple
model of the environment and following the evolution of the pure state for the
whole system. We found that decoherence occurs for very general initial
conditions and were able to confirm a number of widely accepted features of the
process.
|
[
{
"version": "v1",
"created": "Wed, 14 Jul 1999 16:27:52 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Carazza",
"B.",
"",
"Dipartimento di Fisica, Parma, Italy"
]
] |
quant-ph/9907052
|
A. M. Lisewski
|
A.M. Lisewski
|
Can all neurobiological processes be described by classical physics?
| null | null | null | null |
quant-ph
| null |
We discuss results recently given in an article by M. Tegmark
(quant-ph/9907009) where he argues that neurons can be described appropriately
by pure classical physics. This letter is dedicated to the question if this is
really the case when the role of dissipation and noise -- the two concurrent
phenomena present in these biological structures -- is taken into account. We
argue that dissipation and noise might well be of quantum origin and give also
a possible reason why neural dynamics is not classical.
|
[
{
"version": "v1",
"created": "Thu, 15 Jul 1999 08:42:59 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Lisewski",
"A. M.",
""
]
] |
quant-ph/9907053
|
Thorsten Koehler
|
R. E. Grisenti, W. Schoellkopf, J. P. Toennies, G. C. Hegerfeldt, and
T. Koehler
|
Determination of Atom-Surface van der Waals Potentials from
Transmission-Grating Diffraction Intensities
|
4 pages Revtex + 3 figures. Physical Review Letters (in press)
|
Phys.Rev.Lett. 83 (1999) 1755-1758
|
10.1103/PhysRevLett.83.1755
| null |
quant-ph
| null |
Molecular beams of rare gas atoms and D_2 have been diffracted from
100 nm period SiN_x transmission gratings. The relative intensities of the
diffraction peaks out to the 8th order depend on the diffracting particle and
are interpreted in terms of effective slit widths. These differences have been
analyzed by a new theory which accounts for the long-range van der Waals
-C_3/l^3 interaction of the particles with the walls of the grating bars. The
values of the C_3 constant for two different gratings are in good agreement and
the results exhibit the expected linear dependence on the dipole
polarizability.
|
[
{
"version": "v1",
"created": "Thu, 15 Jul 1999 12:19:22 GMT"
}
] | 2016-09-08T00:00:00 |
[
[
"Grisenti",
"R. E.",
""
],
[
"Schoellkopf",
"W.",
""
],
[
"Toennies",
"J. P.",
""
],
[
"Hegerfeldt",
"G. C.",
""
],
[
"Koehler",
"T.",
""
]
] |
quant-ph/9907054
|
Miloslav Znojil
|
Miloslav Znojil
|
Bound states in the Kratzer plus polynomial potentials and their new
exact tractability via nonlinear algebraic equations
|
24 pages incl. 4 tables, submitted to J. Math. Chem
|
J.Math.Chem. 26 (1999) 157-172
| null | null |
quant-ph
| null |
Schroedinger equation with potentials of the Kratzer plus polynomial type
(say, quartic V(r) = A r^4 +B r^3 + C r^2+D r + F/r + G/r^2 etc) is considered.
A new method of exact construction of some of its bound states is then
proposed. it is based on the Taylor series terminated rigorously after N+1
terms at specific couplings and energies. This enables us to find the exact,
complete and compact unperturbed solution of the Magyari's N+2 coupled and
nonlinear algebraic conditions of the termination in the strong-coupling regime
with G \to \infty. Next, at G < \infty, we adapt the Rayleigh-Schroedinger
perturbation theory and define the bound states via an innovated, triple
perturbation series. In tests we show that all the correction terms appear in
integer arithmetics and remain, therefore, exact.
|
[
{
"version": "v1",
"created": "Thu, 15 Jul 1999 13:08:19 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Znojil",
"Miloslav",
""
]
] |
quant-ph/9907055
|
Michael G. Moore
|
G.A. Prataviera, E. V. Goldstein, and P. Meystre
|
Mutual coherence of optical and matter waves
| null | null |
10.1103/PhysRevA.60.4846
| null |
quant-ph
| null |
We propose a scheme to measure the cross-correlations and mutual coherence of
optical and matter fields. It relies on the combination of a matter-wave
detector operating by photoionization of the atoms and a traditional absorption
photodetector. We show that the double-detection signal is sensitive to
cross-correlation functions of light and matter waves.
|
[
{
"version": "v1",
"created": "Thu, 15 Jul 1999 20:24:51 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Prataviera",
"G. A.",
""
],
[
"Goldstein",
"E. V.",
""
],
[
"Meystre",
"P.",
""
]
] |
quant-ph/9907056
|
Howard N. Barnum
|
Howard Barnum, Herbert J. Bernstein, Lee Spector
|
A quantum circuit for OR
|
4 pages + 2 postscript figures. Version 3 restores the figures to
Version 2, which changed the title, abstract, introduction and concluding
paragraph, order of material, and emphasis from Version 1. No change in
technical content
| null | null | null |
quant-ph
| null |
We give the first quantum circuit for computing $f(0)$ OR $f(1)$ more
reliably than is classically possible with a single evaluation of the function.
OR therefore joins XOR (i.e. parity, $f(0) \oplus f(1)$) to give the full set
of logical connectives (up to relabeling of inputs and outputs) for which there
is quantum speedup. The XOR algorithm is of fundamental importance in quantum
computation; our OR algorithm (found with the aid of genetic programming), may
represent a new quantum computational effect, also useful as a ``subroutine''.
|
[
{
"version": "v1",
"created": "Fri, 16 Jul 1999 15:00:38 GMT"
},
{
"version": "v2",
"created": "Thu, 30 Sep 1999 21:02:54 GMT"
},
{
"version": "v3",
"created": "Fri, 8 Oct 1999 16:26:32 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Barnum",
"Howard",
""
],
[
"Bernstein",
"Herbert J.",
""
],
[
"Spector",
"Lee",
""
]
] |
quant-ph/9907057
|
Massimiliano F. Sacchi
|
G. M. D'Ariano, M. F. Sacchi, H. P. Yuen
|
On the correspondence between classical and quantum measurements on a
bosonic field
|
RevTex. 17 pages. 1 eps figure. To appear on Mod. Phys. Lett. B
|
Int.J.Mod.Phys. B13 (1999) 3069-3086
|
10.1142/S0217979299002861
| null |
quant-ph
| null |
We study the correspondence between classical and quantum measurements on a
harmonic oscillator that describes a one-mode bosonic field. We connect the
quantum measurement of an observable of the field with the possibility of
amplifying the observable ideally through a quantum amplifier. The
``classical'' measurement corresponds to the joint measurement of the position
$q$ and momentum $p$ of the harmonic oscillator, with following evaluation of a
function $f$ of the outcome $\alpha=q+ip$. For the electromagnetic field the
joint measurement is achieved by a heterodyne detector. The quantum measurement
of an observable $\hat O$ is obtained by preamplifying the heterodyne detector
through an ideal amplifier of $\hat O$, and rescaling the outcome by the gain
$g$. We give a general criterion which states when this preamplified heterodyne
detection scheme approaches the ideal quantum measurement of $\hat O$ in the
limit of infinite gain. We show that this criterion is satisfied and the ideal
measurement is achieved for the case of the photon number operator and for the
quadrature. For both operators the method is robust to nonunit quantum
efficiency of the heterodyne detector. On the other hand, we show that the
preamplified heterodyne detection scheme does not work for arbitrary observable
of the field. As a counterexample, we prove that the simple quadratic function
of the field $\hat K=i(a^{\dag 2}-a^2)/2$ has no corresponding polynomial
function $f(\alpha,\bar \alpha)$---including the obvious choice
$f=\hbox{Im}(\alpha^2)$---that allows the measurement of $\hat K$ through the
preamplified heterodyne measurement scheme.
|
[
{
"version": "v1",
"created": "Fri, 16 Jul 1999 16:06:31 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"D'Ariano",
"G. M.",
""
],
[
"Sacchi",
"M. F.",
""
],
[
"Yuen",
"H. P.",
""
]
] |
quant-ph/9907058
|
C. Y. Chen
|
C.Y.Chen
|
Transition probability and preferential gauge
|
7 pages, O figure
| null | null | null |
quant-ph
| null |
This paper is concerned with whether or not the preferential gauge can ensure
the uniqueness and correctness of results obtained from the standard
time-dependent perturbation theory, in which the transition probability is
formulated in terms of matrix elements of Hamiltonian.
|
[
{
"version": "v1",
"created": "Sat, 17 Jul 1999 02:22:16 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Chen",
"C. Y.",
""
]
] |
quant-ph/9907059
|
M. Czachor
|
Marek Czachor, Heinz-Dietrich Doebner, Monika Syty, and Krzysztof
Wasylka
|
Von Neumann equations with time-dependent Hamiltonians and
supersymmetric quantum mechanics
|
revtex, 3 eps files
|
Phys.Rev.E61:3325-3329,2000
|
10.1103/PhysRevE.61.3325
| null |
quant-ph
| null |
Starting with a time-independent Hamiltonian $h$ and an appropriately chosen
solution of the von Neumann equation $i\dot\rho(t)=[ h,\rho(t)]$ we construct
its binary-Darboux partner $h_1(t)$ and an exact scattering solution of
$i\dot\rho_1(t)=[h_1(t),\rho_1(t)]$ where $h_1(t)$ is time-dependent and not
isospectral to $h$. The method is analogous to supersymmetric quantum mechanics
but is based on a different version of a Darboux transformation. We illustrate
the technique by the example where $h$ corresponds to a 1-D harmonic
oscillator. The resulting $h_1(t)$ represents a scattering of a soliton-like
pulse on a three-level system.
|
[
{
"version": "v1",
"created": "Sat, 17 Jul 1999 15:02:46 GMT"
}
] | 2008-12-18T00:00:00 |
[
[
"Czachor",
"Marek",
""
],
[
"Doebner",
"Heinz-Dietrich",
""
],
[
"Syty",
"Monika",
""
],
[
"Wasylka",
"Krzysztof",
""
]
] |
quant-ph/9907060
|
Afshin Shafiee
|
Afshin Shafiee and Mehdi Golshani
|
The Possibility of Factorizable Contextual Hidden Variable Theories
|
10 pages, no figure
| null | null | null |
quant-ph
| null |
Considering an extended type of Bohm's version of EPR thought experiment, we
derive Bell's inequality for the case of factorizable contextual hidden
variable theories which are consistent with the predictions of quantum theory.
Usually factorizability is associated with non-contextuality. Here, we show
that factorizability is consistent with contextuality, even for the ordinary
Bohm's version of EPR thought experiment.
|
[
{
"version": "v1",
"created": "Tue, 20 Jul 1999 08:19:31 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Sep 1999 07:19:43 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Shafiee",
"Afshin",
""
],
[
"Golshani",
"Mehdi",
""
]
] |
quant-ph/9907061
|
Thomas Durt
|
Thomas Durt
|
Comment on ``A local hidden variable model of quantum correlations
exploiting the detection loophole''
|
2 pages
| null | null | null |
quant-ph
| null |
We study in this short comment the analogies and the differences that exist
between several local hidden variable models.
|
[
{
"version": "v1",
"created": "Tue, 20 Jul 1999 09:36:46 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Durt",
"Thomas",
""
]
] |
quant-ph/9907062
|
Dae-Yup
|
Dae-Yup Song
|
Periodic Hamiltonian and Berry's phase in harmonic oscillators
|
11 pages, no figure, Phys. Rev. A (in press, as a Brief Reprt) An
equality added in Eq.(16)
|
Phys.Rev.A61:024102,2000
|
10.1103/PhysRevA.61.024102
| null |
quant-ph
| null |
For a time-dependent $\tau$-periodic harmonic oscillator of two linearly
independent homogeneous solutions of classical equation of motion which are
bounded all over the time (stable), it is shown, there is a representation of
states cyclic up to multiplicative constants under $\tau$-evolution or
$2\tau$-evolution depending on the model. The set of the wave functions is
complete. Berry's phase which could depend on the choice of representation can
be defined under the $\tau$- or $2\tau$-evolution in this representation. If a
homogeneous solution diverges as the time goes to infinity, it is shown that,
Berry's phase can not be defined in any representation considered. Berry's
phase for the driven harmonic oscillator is also considered. For the cases
where Berry's phase can be defined, the phase is given in terms of solutions of
the classical equation of motion.
|
[
{
"version": "v1",
"created": "Tue, 20 Jul 1999 10:06:28 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Sep 1999 07:55:30 GMT"
},
{
"version": "v3",
"created": "Wed, 20 Oct 1999 08:49:56 GMT"
}
] | 2008-12-18T00:00:00 |
[
[
"Song",
"Dae-Yup",
""
]
] |
quant-ph/9907063
|
Lieven Vandersypen
|
Costantino S. Yannoni (1), Mark H. Sherwood (1), Lieven M.K.
Vandersypen (1 and 2), Dolores C. Miller (1), Mark G. Kubinec (3), Isaac L.
Chuang (1) ((1) IBM Almaden Research Center (2) Solid State and Photonics
Laboratory, Stanford University (3) College of Chemistry, UC Berkeley)
|
Nuclear Magnetic Resonance Quantum Computing Using Liquid Crystal
Solvents
|
Minor changes. Published in Appl. Phys. Lett. v.75, no.22, 29 Nov
1999, p.3563-3565
| null |
10.1063/1.125389
| null |
quant-ph
| null |
Liquid crystals offer several advantages as solvents for molecules used for
nuclear magnetic resonance quantum computing (NMRQC). The dipolar coupling
between nuclear spins manifest in the NMR spectra of molecules oriented by a
liquid crystal permits a significant increase in clock frequency, while short
spin-lattice relaxation times permit fast recycling of algorithms, and save
time in calibration and signal-enhancement experiments. Furthermore, the use of
liquid crystal solvents offers scalability in the form of an expanded library
of spin-bearing molecules suitable for NMRQC. These ideas are demonstrated with
the successful execution of a 2-qubit Grover search using a molecule
($^{13}$C$^{1}$HCl$_3$) oriented in a liquid crystal and a clock speed eight
times greater than in an isotropic solvent. Perhaps more importantly, five
times as many logic operations can be executed within the coherence time using
the liquid crystal solvent.
|
[
{
"version": "v1",
"created": "Wed, 21 Jul 1999 00:57:33 GMT"
},
{
"version": "v2",
"created": "Sun, 12 Dec 1999 05:35:31 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Yannoni",
"Costantino S.",
"",
"1 and 2"
],
[
"Sherwood",
"Mark H.",
"",
"1 and 2"
],
[
"Vandersypen",
"Lieven M. K.",
"",
"1 and 2"
],
[
"Miller",
"Dolores C.",
""
],
[
"Kubinec",
"Mark G.",
""
],
[
"Chuang",
"Isaac L.",
""
]
] |
quant-ph/9907064
|
Gennadiy Filippov
|
G.M. Filippov
|
Interaction of Radiation and a Relativistic Electron in Motion in a
Constant Magnetic Field
|
29 pages, no figures
|
J.Exp.Theor.Phys. 86 (1998) 459; Zh.Eksp.Teor.Fiz. 113 (1998)
841-864
|
10.1134/1.558491
| null |
quant-ph
| null |
The work examines the effect of multiple photon emission on the quantum
mechanical state of an electron emitting synchrotron radiation and on the
intensity of that radiation. Calculations are done with the variant of
perturbation theory based on the use of extended coherent states. A general
formula is derived for the number of emitted photons, which allows for taking
into account their mutual interaction. A model problem is used to demonstrate
the absence of the infrared catastrophe in the modified perturbation theory.
Finally, the electron density matrix is calculated, and the analysis of this
matrix makes it possible to conclude that the degree of the elecron's spatial
localization increases with the passage of time if the electron is being
accelerated.
|
[
{
"version": "v1",
"created": "Wed, 21 Jul 1999 08:59:45 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Filippov",
"G. M.",
""
]
] |
quant-ph/9907065
|
Levente Horvath
|
L. Horvath, B. C. Sanders, B. F. Wielinga
|
Non-simultaneity in two-photon coincidence spectroscopy
|
10 page, REVTeXs, 9 Postscript figures
| null | null | null |
quant-ph
| null |
Photon coincidence spectroscopy relies on detecting multiphoton emissions
from the combined atom-cavity system in atomic beam cavity quantum
electrodynamics experiments. These multiphoton emissions from the cavity are
nearly simultaneous approximately on the cavity lifetime scale. We determine
the optimal time for the detection window of photon pairs in two-photon
coincidence spectroscopy. If the window time is too short, some photon pairs
will not be detected; if the window time is too long, too many nearly
coincident independent single photons will be falsely interpreted as being a
photon pair. The paper has been submitted to The European Physical Journal D.
|
[
{
"version": "v1",
"created": "Wed, 21 Jul 1999 09:05:28 GMT"
}
] | 2009-09-25T00:00:00 |
[
[
"Horvath",
"L.",
""
],
[
"Sanders",
"B. C.",
""
],
[
"Wielinga",
"B. F.",
""
]
] |
quant-ph/9907066
|
Serge Massar
|
S. Massar and S. Popescu
|
How much information can be obtained by a quantum measurement?
|
13 pages
|
Phys.Rev. A61 (2000) 062303
|
10.1103/PhysRevA.61.062303
| null |
quant-ph
| null |
How much information about an unknown quantum state can be obtained by a
measurement? We propose a model independent answer: the information obtained is
equal to the minimum entropy of the outputs of the measurement, where the
minimum is taken over all measurements which measure the same ``property'' of
the state. This minimization is necessary because the measurement outcomes can
be redundant, and this redundancy must be eliminated. We show that this minimum
entropy is less or equal than the von Neumann entropy of the unknown states.
That is a measurement can extract at most one meaningful bit from every qubit
carried by the unknown states.
|
[
{
"version": "v1",
"created": "Wed, 21 Jul 1999 09:17:44 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Massar",
"S.",
""
],
[
"Popescu",
"S.",
""
]
] |
quant-ph/9907067
|
Farrokh Vatan
|
P. Oscar Boykin, Tal Mor, Vwani Roychowdhury, and Farrokh Vatan
|
Algorithms on Ensemble Quantum Computers
|
16 pages, 4 figures
| null | null | null |
quant-ph
| null |
In ensemble (or bulk) quantum computation, measurements of qubits in an
individual computer cannot be performed. Instead, only expectation values can
be measured. As a result of this limitation on the model of computation,
various important algorithms cannot be processed directly on such computers,
and must be modified. We provide modifications of various existing protocols,
including algorithms for universal fault--tolerant computation, Shor's
factorization algorithm (which can be extended to any algorithm computing an NP
function), and some search algorithms to enable processing them on ensemble
quantum computers.
|
[
{
"version": "v1",
"created": "Wed, 21 Jul 1999 21:31:18 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Boykin",
"P. Oscar",
""
],
[
"Mor",
"Tal",
""
],
[
"Roychowdhury",
"Vwani",
""
],
[
"Vatan",
"Farrokh",
""
]
] |
quant-ph/9907068
|
Gheorghe-Sorin Paraoanu
|
Gh.-S. Paraoanu and H. Scutaru
|
Fidelity for Multimode Thermal Squeezed States
|
5 pages, RevTex, submitted to Phys. Rev. A
| null |
10.1103/PhysRevA.61.022306
| null |
quant-ph
| null |
In the theory of quantum transmission of information the concept of fidelity
plays a fundamental role. An important class of channels, which can be
experimentally realized in quantum optics, is that of Gaussian quantum
channels. In this work we present a general formula for fidelity in the case of
two arbitrary Gaussian states. From this formula one can get a previous result
(H. Scutaru, J. Phys. A: Mat. Gen {\bf 31}, 3659 (1998)), for the case of a
single mode; or, one can apply it to obtain a closed compact expression for
multimode thermal states.
|
[
{
"version": "v1",
"created": "Wed, 21 Jul 1999 23:59:42 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Paraoanu",
"Gh. -S.",
""
],
[
"Scutaru",
"H.",
""
]
] |
quant-ph/9907069
|
Francois Gieres
|
F. Gieres
|
Mathematical surprises and Dirac's formalism in quantum mechanics
|
Largely extended and reorganized version, with new title and abstract
and with 2 figures added (published version), 54 pages
|
Rep.Prog.Phys. 63 (2000) 1893
|
10.1088/0034-4885/63/12/201
|
LYCEN 9960a
|
quant-ph cond-mat hep-th math-ph math.MP nucl-th physics.ed-ph
| null |
By a series of simple examples, we illustrate how the lack of mathematical
concern can readily lead to surprising mathematical contradictions in wave
mechanics. The basic mathematical notions allowing for a precise formulation of
the theory are then summarized and it is shown how they lead to an elucidation
and deeper understanding of the aforementioned problems. After stressing the
equivalence between wave mechanics and the other formulations of quantum
mechanics, i.e. matrix mechanics and Dirac's abstract Hilbert space
formulation, we devote the second part of our paper to the latter approach: we
discuss the problems and shortcomings of this formalism as well as those of the
bra and ket notation introduced by Dirac in this context. In conclusion, we
indicate how all of these problems can be solved or at least avoided.
|
[
{
"version": "v1",
"created": "Thu, 22 Jul 1999 14:40:49 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Dec 2001 16:45:21 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Gieres",
"F.",
""
]
] |
quant-ph/9907070
|
Francois Gieres
|
F. Gieres
|
Formalisme de Dirac et surprises mathematiques en mecanique quantique
|
40 pages, French version of the preprint LYCEN 9960a
| null | null |
LYCEN 9960b
|
quant-ph
| null |
Differents formalismes sont utilises en mecanique quantique pour la
description des etats et des observables : la mecanique ondulatoire, la
mecanique matricielle et le formalisme invariant. Nous discutons les problemes
et inconvenients du formalisme invariant ainsi que ceux de la notation des bras
et kets introduite par Dirac dans ce contexte. Nous indiquons comment tous les
problemes peuvent etre resolus ou du moins evites. Une serie d'exemples
illustre les points souleves et montre comment l'insouciance mathematique peut
aisement conduire a des contradictions mathematiques surprenantes.
|
[
{
"version": "v1",
"created": "Thu, 22 Jul 1999 14:59:09 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Gieres",
"F.",
""
]
] |
quant-ph/9907071
|
James P. Clemens
|
J. P. Clemens and P. R. Rice
|
Nonclassical effects in a driven atoms/cavity system in the presence of
arbitrary driving field and dephasing
|
8 pages, 10 figures, minor typographical errors corrected, submitted
to Phys Rev A
| null |
10.1103/PhysRevA.61.063810
| null |
quant-ph
| null |
We investigate the photon statistics of light transmitted from a driven
optical cavity containing one or two atoms interacting with a single mode of
the cavity field. We treat arbitrary driving fields with emphasis on departure
from previous weak field results. In addition effects of dephasing due to
atomic transit through the cavity mode are included using two different models.
We find that both models show the nonclassical correlations are quite sensitive
to dephasing. The effect of multiple atoms on the system dynamics is
investigated by placing two atoms in the cavity mode at different positions,
therefore having different coupling strengths.
|
[
{
"version": "v1",
"created": "Thu, 22 Jul 1999 21:35:51 GMT"
},
{
"version": "v2",
"created": "Wed, 28 Jul 1999 14:49:04 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Clemens",
"J. P.",
""
],
[
"Rice",
"P. R.",
""
]
] |
quant-ph/9907072
|
Mladen Pavicic
|
Mladen Pavicic
|
Spin correlated interferometry for polarized and unpolarized photons on
a beam splitter
|
RevTeX, 19 pages, 1 ps figure, author web page at
http://m3k.grad.hr/pavicic
|
Phys.Rev.A50:3486-3491,1994
|
10.1103/PhysRevA.50.3486
| null |
quant-ph
| null |
Spin interferometry of the 4th order for independent polarized as well as
unpolarized photons arriving simultaneously at a beam splitter and exhibiting
spin correlation while leaving it, is formulated and discussed in the quantum
approach. Beam splitter is recognized as a source of genuine singlet photon
states. Also, typical nonclassical beating between photons taking part in the
interference of the 4th order is given a polarization dependent explanation.
|
[
{
"version": "v1",
"created": "Thu, 22 Jul 1999 22:03:06 GMT"
}
] | 2008-12-18T00:00:00 |
[
[
"Pavicic",
"Mladen",
""
]
] |
quant-ph/9907073
|
Timothy C. Ralph
|
T.C.Ralph
|
Continuous variable quantum cryptography
|
8 pages, 3 figures
|
Phys.Rev. A61 (2000) 010302
|
10.1103/PhysRevA.61.010302
| null |
quant-ph
| null |
We propose a quantum cryptographic scheme in which small phase and amplitude
modulations of CW light beams carry the key information. The presence of EPR
type correlations provides the quantum protection.
|
[
{
"version": "v1",
"created": "Thu, 22 Jul 1999 23:18:42 GMT"
}
] | 2021-05-26T00:00:00 |
[
[
"Ralph",
"T. C.",
""
]
] |
quant-ph/9907074
|
Doyeol Ahn
|
D. Ahn, J. H. Oh, K. Kimm, and S. W. Hwang
|
Time-convolutionless reduced-density-operator theory of a noisy quantum
channel: a two-bit quantum gate for quantum information processing
| null | null |
10.1103/PhysRevA.61.052310
| null |
quant-ph
| null |
An exact reduced-density-operator for the output quantum states in
time-convolutionless form was derived by solving the quantum Liouville equation
which governs the dynamics of a noisy quantum channel by using a projection
operator method and both advanced and retarded propagators in time. The
formalism developed in this work is general enough to model a noisy quantum
channel provided specific forms of the Hamiltonians for the system, reservoir,
and the mutual interaction between the system and the reservoir are given.
Then, we apply the formulation to model a two-bit quantum gate composed of
coupled spin systems in which the Heisenberg coupling is controlled by the
tunneling barrier between neighboring quantum dots. Gate Characteristics
including the entropy, fidelity, and purity are calculated numerically for both
mixed and entangled initial states.
|
[
{
"version": "v1",
"created": "Fri, 23 Jul 1999 06:30:02 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Ahn",
"D.",
""
],
[
"Oh",
"J. H.",
""
],
[
"Kimm",
"K.",
""
],
[
"Hwang",
"S. W.",
""
]
] |
quant-ph/9907075
|
Dr. Bindu A. Bambha-
|
V. SunilKumar, B. A. Bambah, R. Jagannathan, P. K. Panigrahi and V.
Srinivasan
|
Coherent States of Non-Linear Lie algebras: Application in Quantum
Optics
|
10 pages, Latex
| null |
10.1088/1464-4266/2/2/311
| null |
quant-ph
| null |
We present a general unified approach for finding the coherent states of
polynomially deformed algebras such as the quadratic and Higgs algebras, which
are relevant for various multiphoton processes in quantum optics. We give a
general procedure to map these deformed algebras to appropriate Lie algebras.
This is used, for the non compact cases, to obtain the annihilation operator
coherent states, by finding the canonical conjugates of these operators.
Generalized coherent states, in the Perelomov sense also follow from this
construction. This allows us to explicitly construct coherent states associated
with various quantum optical systems.
|
[
{
"version": "v1",
"created": "Fri, 23 Jul 1999 20:21:37 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"SunilKumar",
"V.",
""
],
[
"Bambah",
"B. A.",
""
],
[
"Jagannathan",
"R.",
""
],
[
"Panigrahi",
"P. K.",
""
],
[
"Srinivasan",
"V.",
""
]
] |
quant-ph/9907076
|
Steve K. Lamoreaux
|
S.K. Lamoreaux
|
Experimental Verifications of the Casimir Attractive Force between Solid
Bodies
|
Submitted to Comments on Atomic and Molecular Physics, H.B.G. Casimir
90th Birthday Commemorative Issue; 2 figures
| null | null |
LA-UR-99-2515
|
quant-ph
| null |
A brief review of the recent experimental verifications of the Casimir force
between extended bodies is presented. With modern techniques, it now appears
feasible to test the force law with 1% precision; I will address the issues
relating to the interpretation of experiments at this level of accuracy
|
[
{
"version": "v1",
"created": "Fri, 23 Jul 1999 21:02:36 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Lamoreaux",
"S. K.",
""
]
] |
quant-ph/9907077
|
Andreas Winter
|
Andreas Winter
|
Coding Theorems of Quantum Information Theory
|
80 pages, Ph.D. dissertation, Uni Bielefeld
| null | null | null |
quant-ph
| null |
Coding theorems and (strong) converses for memoryless quantum communication
channels and quantum sources are proved: for the quantum source the coding
theorem is reviewed, and the strong converse proven. For classical information
transmission via quantum channels we give a new proof of the coding theorem,
and prove the strong converse, even under the extended model of nonstationary
channels. As a by-product we obtain a new proof of the famous Holevo bound.
Then multi-user systems are investigated, and the capacity region for the
quantum multiple access channel is determined. The last chapter contains a
preliminary discussion of some models of compression of correlated quantum
sources, and a proposal for a program to obtain operational meaning for quantum
conditional entropy. An appendix features the introduction of a notation and
calculus of entropy in quantum systems.
|
[
{
"version": "v1",
"created": "Sat, 24 Jul 1999 09:27:46 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Winter",
"Andreas",
""
]
] |
quant-ph/9907078
|
Teimuraz Nadareishvili
|
Ansor A. Khelashvili, George A. Khelashvili, Nikoloz Kiknadze, Temur
P. Nadareishvili
|
On the Abnormal Type Anomalous Solutions of Quasipotential Equations
|
8 pages, LaTex, no figures
| null | null | null |
quant-ph
| null |
It is shown that there exist solutions of the quasipotential equations
exhibiting the abnormal type behaviour of the Bethe-Salpeter equation.
|
[
{
"version": "v1",
"created": "Sat, 24 Jul 1999 15:09:33 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Khelashvili",
"Ansor A.",
""
],
[
"Khelashvili",
"George A.",
""
],
[
"Kiknadze",
"Nikoloz",
""
],
[
"Nadareishvili",
"Temur P.",
""
]
] |
quant-ph/9907079
|
Alexander Y. Vlasov
|
Alexander Yu. Vlasov (FRC/IRH)
|
Quantum Gates and Clifford Algebras
|
10 pages AMS-LaTeXe, Poster on TMR Network School on Quantum
Computation and Quantum Information Theory, Italy, Torino, July 12-23 1999
(v2 with tiny changes and typo corrections)
| null | null | null |
quant-ph
| null |
Clifford algebras are used for definition of spinors. Because of using
spin-1/2 systems as an adequate model of quantum bit, a relation of the
algebras with quantum information science has physical reasons. But there are
simple mathematical properties of the algebras those also justifies such
applications.
First, any complex Clifford algebra with 2n generators, Cl(2n,C), has
representation as algebra of all 2^n x 2^n complex matrices and so includes
unitary matrix of any quantum n-gate. An arbitrary element of whole algebra
corresponds to general form of linear complex transformation. The last property
is also useful because linear operators are not necessary should be unitary if
they used for description of restriction of some unitary operator to subspace.
The second advantage is simple algebraic structure of Cl(2n) that can be
expressed via tenzor product of standard "building units" and similar with
behavior of composite quantum systems. The compact notation with 2n generators
also can be used in software for modeling of simple quantum circuits by modern
conventional computers.
|
[
{
"version": "v1",
"created": "Mon, 26 Jul 1999 21:59:35 GMT"
},
{
"version": "v2",
"created": "Fri, 30 Jul 1999 15:41:30 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Vlasov",
"Alexander Yu.",
"",
"FRC/IRH"
]
] |
quant-ph/9907080
|
Arvind
|
Eqab M. Rabei and Arvind and R. Simon and N. Mukunda
|
Bargmann Invariants and Geometric Phases - a Generalised Connection
|
Accepted for publication in Physical Review A
|
Phys.Rev.A60:3397,1999
|
10.1103/PhysRevA.60.3397
| null |
quant-ph
| null |
We develop the widest possible generalisation of the well-known connection
between quantum mechanical Bargmann invariants and geometric phases. The key
notion is that of null phase curves in quantum mechanical ray and Hilbert
spaces. Examples of such curves are developed. Our generalisation is shown to
be essential to properly understand geometric phase results in the cases of
coherent states and of Gaussian states. Differential geometric aspects of null
phase curves are also briefly explored.
|
[
{
"version": "v1",
"created": "Mon, 26 Jul 1999 05:05:00 GMT"
}
] | 2008-12-18T00:00:00 |
[
[
"Rabei",
"Eqab M.",
""
],
[
"Arvind",
"",
""
],
[
"Simon",
"R.",
""
],
[
"Mukunda",
"N.",
""
]
] |
quant-ph/9907081
|
Peter Loeber
|
Rudolf Ahlswede and Peter Loeber
|
Quantum Data Processing
|
8 pages
| null | null | null |
quant-ph
| null |
We prove a data processing inequality for quantum communication channels,
which states that processing a received quantum state may never increase the
mutual information between input and output states.
|
[
{
"version": "v1",
"created": "Mon, 26 Jul 1999 14:22:42 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Ahlswede",
"Rudolf",
""
],
[
"Loeber",
"Peter",
""
]
] |
quant-ph/9907082
|
Habatwa Vincent Mweene
|
Habatwa Vincent Mweene (Physics Department, University of Zambia)
|
New Treatment of Systems of Compounded Angular Momentum
|
44 pages, LateX. The notation has been thoroughly revised to improve
comprehension and to facilitate further development of the theory. Some
typographical errors have been corrected
| null | null |
UNZAPHYS-006
|
quant-ph
| null |
The approach to quantum mechanics which we have used to derive the matrix
treatment of spin from first principles is now employed to treat systems of
compounded angular momentum. A general treatment is first given, which is then
applied to the concrete cases of a spin-0 and a spin-1 system obtained by
adding the spins of two spin-1/2 systems. Thus the probability amplitudes for
measurements on the systems are derived, as well as the matrix vectors and
operators corresponding to the systems. The matrix operators and states
obtained are different from the standard forms and are much more generalized.
The new results are applied to the case of joint measurements on the subsystems
of such a system; this is a problem that has been made very topical by the high
level of interest in the foundations of quantum mechanics. As a consequence of
the insights arising from this treatment, we show that the Clebsch-Gordan
coefficients are amenable to generalization, and we give the generalized forms
for these cases.
|
[
{
"version": "v1",
"created": "Mon, 26 Jul 1999 14:56:28 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Oct 1999 15:14:17 GMT"
},
{
"version": "v3",
"created": "Wed, 15 Mar 2000 08:02:57 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Mweene",
"Habatwa Vincent",
"",
"Physics Department, University of Zambia"
]
] |
quant-ph/9907083
|
Stefano Mancini
|
S. Mancini, A. Gatti, L. A. Lugiato
|
Parametric image amplification in optical cavities
|
6 pages, 1 figure
|
Fortsch.Phys. 48 (2000) 665-669
|
10.1002/(SICI)1521-3978(200005)48:5/7<665::AID-PROP665>3.0.CO;2-4
| null |
quant-ph
| null |
We show the possibility of noiseless amplification of an optical image in
cavities containing a parametric oscillator. We consider a confocal ring cavity
with plane mirrors and compare with the case of planar cavity. In the latter
case the system operates with severe spatial limitations, while in the confocal
case, there is the possibility of preserving the signal-to-noise ratio while
amplifying uniformely the entire image.
|
[
{
"version": "v1",
"created": "Mon, 26 Jul 1999 15:21:50 GMT"
}
] | 2016-10-26T00:00:00 |
[
[
"Mancini",
"S.",
""
],
[
"Gatti",
"A.",
""
],
[
"Lugiato",
"L. A.",
""
]
] |
quant-ph/9907084
|
Stefano Mancini
|
S. Mancini, V. I. Man'ko
|
Spectrum of light scattered from a deformed Bose-Einstein condensate
|
10 pages, 2 figures, to appear in Phys. Lett. A
|
Phys.Lett. A259 (1999) 67-70
|
10.1016/S0375-9601(99)00400-4
| null |
quant-ph
| null |
The spectrum of light scattered from a Bose-Einstein condensate is studied in
the limit of particle-number conservation. To this end, a description in terms
of deformed bosons is invoked and this leads to a deviation from the usual
predict spectrum's shape as soon as the number of particles decreases.
|
[
{
"version": "v1",
"created": "Mon, 26 Jul 1999 15:38:10 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Mancini",
"S.",
""
],
[
"Man'ko",
"V. I.",
""
]
] |
quant-ph/9907085
|
James P. Clemens
|
J. P. Clemens, P. R. Rice, and L. M. Pedrotti
|
Output Spectrum of Single-Atom Lasers
|
11 pages, 20 figures, minor typographical errors corrected
| null | null | null |
quant-ph
| null |
We consider a laser composed of a single atom in a microcavity, with a
coherent or incoherent pump. We consider both three- and four-level gain
schemes, and examine the output spectrum of such lasers. We find that the
linewidth generally scales as the inverse of the photon number. For large
atom-field coupling, a vacuum-Rabi doublet structure is obtained. In the
three-level case, this vacuum-Rabi splitting is apparent only for small
intracavity photon numbers, and vanishes for large pumps. In the four-level
scheme, the vacuum-Rabi structure appears at a nonzero pump level, and is
maintained for large pumps, even when the intracavity photon number is larger
than unity. This behavior is explained utilizing the quantum trajectory
approach.
|
[
{
"version": "v1",
"created": "Mon, 26 Jul 1999 18:30:33 GMT"
},
{
"version": "v2",
"created": "Tue, 27 Jul 1999 21:24:24 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Clemens",
"J. P.",
""
],
[
"Rice",
"P. R.",
""
],
[
"Pedrotti",
"L. M.",
""
]
] |
quant-ph/9907086
|
Fabrizio Tamburini
|
Fabrizio Tamburini, Sergio Ortolani, Antonio Bianchini (Dept. of
Astronomy, University of Padua, Italy)
|
EPR statistical mixture of correlated states with fractional brownian
process induced by third party interaction
|
4 pages, RevteX
| null | null | null |
quant-ph
| null |
This paper has been withdrawn by the author(s)
|
[
{
"version": "v1",
"created": "Tue, 27 Jul 1999 07:03:08 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Aug 1999 15:01:19 GMT"
},
{
"version": "v3",
"created": "Thu, 25 May 2000 19:56:45 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Tamburini",
"Fabrizio",
"",
"Dept. of\n Astronomy, University of Padua, Italy"
],
[
"Ortolani",
"Sergio",
"",
"Dept. of\n Astronomy, University of Padua, Italy"
],
[
"Bianchini",
"Antonio",
"",
"Dept. of\n Astronomy, University of Padua, Italy"
]
] |
quant-ph/9907087
|
Alexander S. Holevo
|
A. S. Holevo
|
Reliability function of general classical-quantum channel
|
15 pages, partially reported at the Workshop on Complexity,
Computation and Physics of Information, Cambridge, July 5-23, 1999; to appear
in IEEE Trans. on Information Theory. Several corrections suggested by the
referees are included
| null |
10.1109/18.868501
| null |
quant-ph
| null |
In information theory the reliability function and its bounds, describing the
exponential behavior of the error probability, are the most important
quantitative characteristics of the channel performance. From a general point
of view, these bounds provide certain measures of distinguishability of a given
set of states. In an earlier paper we introduced quantum analogs of the random
coding and the expurgation lower bounds for the case of pure signal states.
Here we discuss the general case, in particular, we prove the previously
conjectured expurgation bound and find the quantum cutoff rate in the case of
arbitrary mixed signal states.
|
[
{
"version": "v1",
"created": "Tue, 27 Jul 1999 11:36:00 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Jan 2000 08:51:56 GMT"
}
] | 2016-11-17T00:00:00 |
[
[
"Holevo",
"A. S.",
""
]
] |
quant-ph/9907088
|
Kwek LC
|
Xiang-Bin Wang, C.H. Oh and L.C. Kwek
|
On Bures fidelity of displaced squeezed thermal states
|
10 pages with RevTex required
|
Phys.Rev.A58:4186,1998
|
10.1103/PhysRevA.58.4186
| null |
quant-ph astro-ph
| null |
Fidelity plays a key role in quantum information and communication theory.
Fidelity can be interpreted as the probability that a decoded message possesses
the same information content as the message prior to coding and transmission.
In this paper, we give a formula of Bures fidelity for displaced squeezed
thermal states directly by the displacement and squeezing parameters and
birefly discuss how the results can apply to quantum information theory.
|
[
{
"version": "v1",
"created": "Tue, 27 Jul 1999 12:45:49 GMT"
}
] | 2008-12-18T00:00:00 |
[
[
"Wang",
"Xiang-Bin",
""
],
[
"Oh",
"C. H.",
""
],
[
"Kwek",
"L. C.",
""
]
] |
quant-ph/9907090
|
Eduard Schmidt
|
Eduard Schmidt, Ludwig Knoell, and Dirk-Gunnar Welsch
|
Nonclassical correlations in damped N-solitons
|
4 pages, RevTeX, 2 PS-figures, contribution to the Sixth
International Conference on Squeezed states and Uncertainty relations ICSSUR
VI, Naples 24-29 May 1999
| null | null |
FSU TPI QO-07/99
|
quant-ph
| null |
The quantum statistics of damped higher-order optical solitons are analyzed
numerically, using cumulant-expansion techniques in Gaussian approximation. A
detailed analysis of nonclassical properties in both the time and the frequency
domain is given, with special emphasis on the role of absorption. Highly
nonclassical broadband spectral correlation is predicted.
|
[
{
"version": "v1",
"created": "Tue, 27 Jul 1999 16:14:55 GMT"
},
{
"version": "v2",
"created": "Fri, 30 Jul 1999 21:17:10 GMT"
}
] | 2009-09-25T00:00:00 |
[
[
"Schmidt",
"Eduard",
""
],
[
"Knoell",
"Ludwig",
""
],
[
"Welsch",
"Dirk-Gunnar",
""
]
] |
quant-ph/9907091
|
Massimiliano F. Sacchi
|
G. M. D'Ariano, L. Maccone, M. F. Sacchi, A. Garuccio
|
Tomographic test of Bell's inequality
|
RevTex. 8 pages, 3 ps figures. To appear on J. Opt. B
|
J.Opt.B1:576,1999
|
10.1088/1464-4266/1/5/314
| null |
quant-ph
| null |
We present a homodyne detection scheme to verify Bell's inequality on
correlated optical beams at the output of a nondegenerate parametric amplifier.
Our approach is based on tomographic measurement of the joint detection
probabilities, which allows high quantum efficiency at detectors. A
self-homodyne scheme is suggested to simplify the experimental set-up.
|
[
{
"version": "v1",
"created": "Wed, 28 Jul 1999 09:28:49 GMT"
}
] | 2011-03-28T00:00:00 |
[
[
"D'Ariano",
"G. M.",
""
],
[
"Maccone",
"L.",
""
],
[
"Sacchi",
"M. F.",
""
],
[
"Garuccio",
"A.",
""
]
] |
quant-ph/9907092
|
Ned Lynne Floyd
|
Edward R. Floyd
|
Classical Limit of the Trajectory Representation of Quantum Mechanics,
Loss of Information and Residual Indeterminacy
|
12 pages LaTeX 2.09. No figures. Accepted by Int. J. Mod. Phys. A.
Minor revisions to conform with galley proofs. Acknowledgements expanded.
References updated. Key words: classical limits, trajectory interpretation,
Planck's correspondence principle, residual indeterminacy, 't Hooft's
information loss and equivalence classes, Heisenberg uncertainty principle.
Subj-clas: Quantum Physics; Mathematical Physics
|
Int.J.Mod.Phys. A15 (2000) 1363-1378
|
10.1142/S0217751X00000604
| null |
quant-ph hep-th math-ph math.MP
| null |
The trajectory representation in the classical limit (\hbar \to 0) manifests
a residual indeterminacy. We show that the trajectory representation in the
classical limit goes to neither classical mechanics (Planck's correspondence
principle) nor statistical mechanics. This residual indeterminacy is contrasted
to Heisenberg uncertainty. We discuss the relationship between indeterminacy
and 't Hooft's information loss and equivalence classes.
|
[
{
"version": "v1",
"created": "Wed, 28 Jul 1999 14:56:59 GMT"
},
{
"version": "v2",
"created": "Sat, 27 Nov 1999 05:54:13 GMT"
},
{
"version": "v3",
"created": "Sat, 12 Feb 2000 17:26:57 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Floyd",
"Edward R.",
""
]
] |
quant-ph/9907093
|
James P. Clemens
|
J. P. Clemens, P. R. Rice, P. K. Rungta, and R. J. Brecha
|
Two-Level Atom in an Optical Parametric Oscillator: Spectra of
Transmitted and Fluorescent Fields in the Weak Driving Field Limit
|
10 pages, 17 figures, submitted to Phys Rev A
| null |
10.1103/PhysRevA.62.033802
| null |
quant-ph
| null |
We consider the interaction of a two-level atom inside an optical parametric
oscillator. In the weak driving field limit, we essentially have an atom-cavity
system driven by the occasional pair of correlated photons, or weakly squeezed
light. We find that we may have holes, or dips, in the spectrum of the
fluorescent and transmitted light. This occurs even in the strong-coupling
limit when we find holes in the vacuum-Rabi doublet. Also, spectra with a
sub-natural linewidth may occur. These effects disappear for larger driving
fields, unlike the spectral narrowing obtained in resonance fluorescence in a
squeezed vacuum; here it is important that the squeezing parameter $N$ tends to
zero so that the system interacts with only one correlated pair of photons at a
time. We show that a previous explanation for spectral narrowing and spectral
holes for incoherent scattering is not applicable in the present case, and
propose a new explanation. We attribute these anomalous effects to quantum
interference in the two-photon scattering of the system.
|
[
{
"version": "v1",
"created": "Wed, 28 Jul 1999 19:11:52 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Clemens",
"J. P.",
""
],
[
"Rice",
"P. R.",
""
],
[
"Rungta",
"P. K.",
""
],
[
"Brecha",
"R. J.",
""
]
] |
quant-ph/9907094
|
Jose L. Cereceda
|
Jose L. Cereceda
|
A simple proof of the converse of Hardy's theorem
|
LaTeX, 16 pages + 2 eps figures
| null | null | null |
quant-ph
| null |
In this paper we provide a simple proof of the fact that for a system of two
spin-1/2 particles, and for a choice of observables, there is a unique state
which shows Hardy-type nonlocality. Moreover, an explicit expression for the
probability that an ensemble of particle pairs prepared in such a state
exhibits a Hardy-type nonlocality contradiction is given in terms of two
independent parameters related to the observables involved. Incidentally, a
wrong statement expressed in Mermin's proof of the converse [N.D. Mermin, Am.
J. Phys. 62, 880 (1994)] is pointed out.
|
[
{
"version": "v1",
"created": "Wed, 28 Jul 1999 20:03:42 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Cereceda",
"Jose L.",
""
]
] |
quant-ph/9907095
|
Jean-Michel Courty
|
Jean-Michel Courty, Serge Reynaud, (Laboratoire Kastler Brossel)
|
Quantum fluctuations for drag free geodesic motion
|
4 pages, 1 figure, RevTeX, minor changes
|
J.Opt.B Quant.Semiclass.Opt. 2 (2000) 90-93
|
10.1088/1464-4266/2/2/304
| null |
quant-ph
| null |
The drag free technique is used to force a proof mass to follow a geodesic
motion. The mass is protected from perturbations by a cage, and the motion of
the latter is actively controlled to follow the motion of the proof mass. We
present a theoretical analysis of the effects of quantum fluctuations for this
technique. We show that a perfect drag free operation is in principle possible
at the quantum level, in spite of the back action exerted on the mass by the
position sensor.
|
[
{
"version": "v1",
"created": "Thu, 29 Jul 1999 14:11:04 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Dec 1999 13:46:57 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Courty",
"Jean-Michel",
""
],
[
"Reynaud",
"Serge",
""
]
] |
quant-ph/9907096
|
Dr. Daniel A. Lidar
|
Daniel A. Lidar, David Bacon, Julia Kempe and K. Birgitta Whaley
|
Protecting Quantum Information Encoded in Decoherence Free States
Against Exchange Errors
|
7 pages, no figures. Discussion in section V.A. significantly
expanded. Several small changes. Two authors added
|
Phys. Rev. A Vol. 61(5), p. 52307 (2000)
|
10.1103/PhysRevA.61.052307
| null |
quant-ph cond-mat
| null |
The exchange interaction between identical qubits in a quantum information
processor gives rise to unitary two-qubit errors. It is shown here that
decoherence free subspaces (DFSs) for collective decoherence undergo Pauli
errors under exchange, which however do not take the decoherence free states
outside of the DFS. In order to protect DFSs against these errors it is
sufficient to employ a recently proposed concatenated DFS-quantum error
correcting code scheme [D.A. Lidar, D. Bacon and K.B. Whaley, Phys. Rev. Lett.
{\bf 82}, 4556 (1999)].
|
[
{
"version": "v1",
"created": "Thu, 29 Jul 1999 19:51:14 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Aug 1999 21:20:20 GMT"
},
{
"version": "v3",
"created": "Thu, 2 Dec 1999 21:28:54 GMT"
}
] | 2016-09-08T00:00:00 |
[
[
"Lidar",
"Daniel A.",
""
],
[
"Bacon",
"David",
""
],
[
"Kempe",
"Julia",
""
],
[
"Whaley",
"K. Birgitta",
""
]
] |
quant-ph/9907097
|
GuangCan Guo
|
Chuan-Wei Zhang, Zi-Yang Wang, Chuan-Feng Li, and Guang-Can Guo
(University of Science and Technology of China)
|
Realizing probabilistic identification and cloning of quantum states via
universal quantum logic gates
|
9 Pages, 7 Figures, REVTeX, final version
|
Phys. Rev. A 61, 062310 (2000)
|
10.1103/PhysRevA.61.062310
| null |
quant-ph
| null |
Probabilistic quantum cloning and identifying machines can be constructed via
unitary-reduction processes [Duan and Guo, Phys. Rev. Lett. 80, 4999 (1998)].
Given the cloning (identifying) probabilities, we derive an explicit
representation of the unitary evolution and corresponding Hamiltonian to
realize probabilistic cloning (identification). The logic networks are obtained
by decomposing the unitary representation into universal quantum logic
operations. The robustness of the networks is also discussed. Our method is
suitable for a $k$-partite system, such as quantum computer, and may be
generalized to general state-dependent cloning and identification.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 02:19:16 GMT"
},
{
"version": "v2",
"created": "Sat, 22 Jan 2000 08:34:43 GMT"
},
{
"version": "v3",
"created": "Sun, 28 May 2000 14:16:49 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Zhang",
"Chuan-Wei",
"",
"University of Science and Technology of China"
],
[
"Wang",
"Zi-Yang",
"",
"University of Science and Technology of China"
],
[
"Li",
"Chuan-Feng",
"",
"University of Science and Technology of China"
],
[
"Guo",
"Guang-Can",
"",
"University of Science and Technology of China"
]
] |
quant-ph/9907098
|
Guifre Vidal Bonafont
|
Rolf Tarrach and Guifre Vidal
|
Universality of optimal measurements
|
Revtex, 5 pages, no figures
|
Phys. Rev. A 60, R3339 (1999)
|
10.1103/PhysRevA.60.R3339
| null |
quant-ph
| null |
We present optimal and minimal measurements on identical copies of an unknown
state of a qubit when the quality of measuring strategies is quantified with
the gain of information (Kullback of probability distributions). We also show
that the maximal gain of information occurs, among isotropic priors, when the
state is known to be pure. Universality of optimal measurements follows from
our results: using the fidelity or the gain of information, two different
figures of merits, leads to exactly the same conclusions. We finally
investigate the optimal capacity of $N$ copies of an unknown state as a quantum
channel of information.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 07:47:15 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Tarrach",
"Rolf",
""
],
[
"Vidal",
"Guifre",
""
]
] |
quant-ph/9907099
|
Sergei Kulik
|
A.V.Burlakov, M.V.Chekhova, O.A.Karabutova, D.N.Klyshko, and S.P.Kulik
|
Polarization state of a biphoton: quantum ternary logic
| null | null |
10.1103/PhysRevA.60.R4209
| null |
quant-ph
| null |
Polarization state of biphoton light generated via collinear
frequency-degenerate spontaneous parametric down-conversion is considered. A
biphoton is described by a three-component polarization vector, its arbitrary
transformations relating to the SU(3) group. A subset of such transformations,
available with retardation plates, is realized experimentally. In particular,
two independent orthogonally polarized beams of type-I biphotons are
transformed into a beam of type-II biphotons. Polarized biphotons are suggested
as ternary analogs of two-state quantum systems (qubits).
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 08:01:19 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Burlakov",
"A. V.",
""
],
[
"Chekhova",
"M. V.",
""
],
[
"Karabutova",
"O. A.",
""
],
[
"Klyshko",
"D. N.",
""
],
[
"Kulik",
"S. P.",
""
]
] |
quant-ph/9907100
|
Walter T. Strunz
|
Walter T. Strunz, Lajos Diosi, Nicolas Gisin, and Ting Yu
|
Quantum trajectories for Brownian motion
|
4 pages, 3 eps figures
|
Phys. Rev. Lett. 83, 4909 (1999)
|
10.1103/PhysRevLett.83.4909
| null |
quant-ph
| null |
We present the stochastic Schroedinger equation for the dynamics of a quantum
particle coupled to a high temperature environment and apply it the dynamics of
a driven, damped, nonlinear quantum oscillator. Apart from an initial slip on
the environmental memory time scale, in the mean, our result recovers the
solution of the known non-Lindblad quantum Brownian motion master equation. A
remarkable feature of our approach is its localization property: individual
quantum trajectories remain localized wave packets for all times, even for the
classically chaotic system considered here, the localization being stronger the
smaller $\hbar$.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 12:10:17 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Strunz",
"Walter T.",
""
],
[
"Diosi",
"Lajos",
""
],
[
"Gisin",
"Nicolas",
""
],
[
"Yu",
"Ting",
""
]
] |
quant-ph/9907101
|
Stefan Weigert
|
Stefan Weigert
|
Expanding Hermitean Operators in a Basis of Projectors on Coherent Spin
States
|
Latex2e, 4 pages
|
J. Opt. B 56 (2004) 489
|
10.1088/1464-4266/6/12/001
| null |
quant-ph
| null |
The expectation values of a hermitean operator A in (2s+1)(2s+1) specific
coherent states of a spin are known to determine the operator unambiguously. As
shown here, (almost) any other (2s+1)(2s+1) coherent states also provide a
basis for self-adjoint operators. This is proven by considering the determinant
of the Gram matrix associated with the coherent state projectors as a
Hamiltonian of a fictitious classical spin system.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 12:37:15 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Weigert",
"Stefan",
""
]
] |
quant-ph/9907102
|
Lutz Polley
|
L. Polley
|
Quantization via hopping amplitudes: Schroedinger equation and free QED
|
LaTeX2e, 12 pages, no figures
| null | null | null |
quant-ph
| null |
Schroedinger's equation with scalar and vector potentials is shown to
describe "nothing but" hopping of a quantum particle on a lattice; any spatial
variation of the hopping amplitudes acts like an external electric and/or
magnetic field. The main point of the argument is the superposition principle
for state vectors; Lagrangians, path integrals, or classical Hamiltonians are
not (!) required. Analogously, the Hamiltonian of the free electromagnetic
field is obtained as a twofold continuum limit of unitary hopping in Z(N) link
configuration space, if gauge invariance and C and P symmetries are imposed.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 12:46:02 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Mar 2000 14:48:35 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Polley",
"L.",
""
]
] |
quant-ph/9907103
|
Jiannis Pachos
|
Jiannis Pachos, Paolo Zanardi and Mario Rasetti
|
Non-Abelian Berry connections for quantum computation
|
5 pages, no figures, revtex, minor changes, version accepted by Phys.
Rev A (rapid comm.)
|
Phys.Rev. A61 (2000) 010305
|
10.1103/PhysRevA.61.010305
| null |
quant-ph hep-th
| null |
In the holonomic approach to quantum computation information is encoded in a
degenerate eigenspace of a parametric family of Hamiltonians and manipulated by
the associated holonomic gates. These are realized in terms of the non-abelian
Berry connection and are obtained by driving the control parameters along
adiabatic loops. We show how it is possible, for a specific model, to
explicitly determine the loops generating any desired logical gate, thus
producing a universal set of unitary transformations. In a multi-partite system
unitary transformations can be implemented efficiently by sequences of local
holonomic gates. Moreover a conceptual scheme for obtaining the required
Hamiltonian family, based on frequently repeated pulses, is discussed, together
with a possible process whereby the initial state can be prepared and the final
one can be measured.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 13:39:28 GMT"
},
{
"version": "v2",
"created": "Thu, 11 Nov 1999 16:10:10 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Pachos",
"Jiannis",
""
],
[
"Zanardi",
"Paolo",
""
],
[
"Rasetti",
"Mario",
""
]
] |
quant-ph/9907104
|
Gernot Alber
|
G. Alber
|
Entanglement and the linearity of quantum mechanics
|
Proceedings of the X International Symposium on Theoretical
Electrical Engineering, ISTET 99, Magdeburg
| null | null | null |
quant-ph
| null |
Optimal universal entanglement processes are discussed which entangle two
quantum systems in an optimal way for all possible initial states. It is
demonstrated that the linear character of quantum theory which enforces the
peaceful coexistence of quantum mechanics and relativity imposes severe
restrictions on the structure of the resulting optimally entangled states.
Depending on the dimension of the one-particle Hilbert space such a universal
process generates either a pure Bell state or mixed entangled states. In the
limit of very large dimensions of the one-particle Hilbert space the
von-Neumann entropy of the optimally entangled state differs from the one of
the maximally mixed two-particle state by one bit only.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 14:26:58 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Alber",
"G.",
""
]
] |
quant-ph/9907105
|
Astrid Lambrecht
|
Astrid Lambrecht and Serge Reynaud
|
Casimir force between metallic mirrors
|
10 pages, 10 figures, uses RevTeX, in v2 minor misprints corrected,
two references updated
|
Eur.Phys.J. D8 (2000) 309-318
|
10.1007/s100530050041
| null |
quant-ph
| null |
We study the influence of finite conductivity of metals on the Casimir
effect. We put the emphasis on explicit theoretical evaluations which can help
comparing experimental results with theory. The reduction of the Casimir force
is evaluated for plane metallic plates. The reduction of the Casimir energy in
the same configuration is also calculated. It can be used to infer the
reduction of the force in the plane-sphere geometry through the `proximity
theorem'. Frequency dependent dielectric response functions of the metals are
represented either by the simple plasma model or, more accurately, by using the
optical data known for the metals used in recent experiments, that is Al, Au
and Cu. In the two latter cases, the results obtained here differ significantly
from those published recently.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 14:33:18 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Sep 1999 12:09:15 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Lambrecht",
"Astrid",
""
],
[
"Reynaud",
"Serge",
""
]
] |
quant-ph/9907106
|
Gernot Alber
|
G. Alber and O. Zobay
|
Semiclassical interferences and catastrophes in the ionization of
Rydberg atoms by half-cycle pulses
| null |
Phys. Rev. A 59, R3174 (1999)
|
10.1103/PhysRevA.59.R3174
| null |
quant-ph
| null |
A multi-dimensional semiclassical description of excitation of a Rydberg
electron by half-cycle pulses is developed and applied to the study of energy-
and angle-resolved ionization spectra. Characteristic novel phenomena
observable in these spectra such as interference oscillations and semiclassical
glory and rainbow scattering are discussed and related to the underlying
classical dynamics of the Rydberg electron. Modifications to the predictions of
the impulse approximation are examined that arise due to finite pulse
durations.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 14:45:43 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Alber",
"G.",
""
],
[
"Zobay",
"O.",
""
]
] |
quant-ph/9907107
|
Gernot Alber
|
O. Zobay and G. Alber
|
Excitation of weakly bound Rydberg electrons by half-cycle pulses
|
Submitted to Phys. Rev. A
| null |
10.1103/PhysRevA.60.1314
| null |
quant-ph
| null |
The interaction of a weakly bound Rydberg electron with an electromagnetic
half-cycle pulse (HCP) is described with the help of a multidimensional
semiclassical treatment. This approach relates the quantum evolution of the
electron to its underlying classical dynamics. The method is nonperturbative
and is valid for arbitrary spatial and temporal shapes of the applied HCP. On
the basis of this approach angle- and energy-resolved spectra resulting from
the ionization of Rydberg atoms by HCPs are analyzed. The different types of
spectra obtainable in the sudden-impact approximation are characterized in
terms of the appearing semiclassical scattering phenomena. Typical
modifications of the spectra originating from finite pulse effects are
discussed.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 14:50:09 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Zobay",
"O.",
""
],
[
"Alber",
"G.",
""
]
] |
quant-ph/9907108
|
Gernot Alber
|
G. Alber
|
Destruction of quantum coherence and wave packet dynamic
|
to be published in `The Physics and Chemistry of Wave Packets',
edited by J. A. Yeazell and T. Uzer (Wiley, N. Y.)
| null | null | null |
quant-ph
| null |
The main aim of this article is to discuss characteristic physical phenomena
which govern the destruction of quantum coherence of material wave packets.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 15:38:18 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Alber",
"G.",
""
]
] |
quant-ph/9907109
|
Oliver Cohen
|
Oliver Cohen
|
Counterfactual entanglement and nonlocal correlations in separable
states
| null |
Phys. Rev. A, volume 60, page 80 (1999)
|
10.1103/PhysRevA.60.80
| null |
quant-ph
| null |
It is shown that the outcomes of measurements on systems in separable mixed
states can be partitioned, via subsequent measurements on a disentangled
extraneous system, into subensembles that display the statistics of entangled
states. This motivates the introduction of the concept of "counterfactual"
entanglement, which can be associated with all separable mixed states including
those that are factorable. This type of entanglement gives rise to a new kind
of postselection-induced Bell inequality violation. The significance of
counterfactual entanglement, and its physical implications, are assessed.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 21:48:35 GMT"
}
] | 2016-09-08T00:00:00 |
[
[
"Cohen",
"Oliver",
""
]
] |
quant-ph/9907110
|
Oliver Cohen
|
Oliver Cohen
|
Quantifying nonorthogonality
|
Accepted for publication in Phys. Rev. A
| null |
10.1103/PhysRevA.60.4349
| null |
quant-ph
| null |
An exploratory approach to the possibility of analyzing nonorthogonality as a
quantifiable property is presented. Three different measures for the
nonorthogonality of pure states are introduced, and one of these measures is
extended to single-particle density matrices using methods that are similar to
recently introduced techniques for quantifying entanglement. Several
interesting special cases are considered. It is pointed out that a measure of
nonorthogonality can meaningfully be associated with a single mixed quantum
state. It is then shown how nonorthogonality can be unlocked with classical
information; this analysis reveals interesting inequalities and points to a
number of connections between nonorthogonality and entanglement.
|
[
{
"version": "v1",
"created": "Fri, 30 Jul 1999 22:00:15 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Cohen",
"Oliver",
""
]
] |
quant-ph/9908001
|
GuangCan Guo
|
Chuan-Wei Zhang, Chuan-Feng Li, Guang-Can Guo (University of Science
and Technology of China)
|
General Strategies for Discrimination of Quantum States
|
8 Pages, No Figure, REVTeX
|
Phys. Lett. A 261 (1999) 25.
|
10.1016/S0375-9601(99)00566-6
| null |
quant-ph
| null |
We derive general discrimination of quantum states chosen from a certain set,
given initial $M$ copies of each state, and obtain the matrix inequality, which
describe the bound between the maximum probability of correctly determining and
that of error. The former works are special cases of our results.
|
[
{
"version": "v1",
"created": "Sat, 31 Jul 1999 07:52:55 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Zhang",
"Chuan-Wei",
"",
"University of Science\n and Technology of China"
],
[
"Li",
"Chuan-Feng",
"",
"University of Science\n and Technology of China"
],
[
"Guo",
"Guang-Can",
"",
"University of Science\n and Technology of China"
]
] |
quant-ph/9908002
|
GuangCan Guo
|
Chuan-Wei Zhang, Chuan-Feng Li, Guang-Can Guo
|
Realization of Probabilistic Identification and Clone of Quantum-States
II Multiparticles System
|
18 Pages, 3 Figures, ReVTeX
| null | null | null |
quant-ph
| null |
We realize the probabilistic cloning and identifying linear independent
quantum states of multi-particles system, given prior probability, with
universal quantum logic gates using the method of unitary representation. Our
result is universal for separate state and entanglement. We also provide the
realization in the condition given $M$ initial copies for each state.
|
[
{
"version": "v1",
"created": "Sat, 31 Jul 1999 08:39:27 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Zhang",
"Chuan-Wei",
""
],
[
"Li",
"Chuan-Feng",
""
],
[
"Guo",
"Guang-Can",
""
]
] |
quant-ph/9908003
|
GuangCan Guo
|
Chuan-Wei Zhang, Chuan-Feng Li, and Guang-Can Guo (University of
Science and Technology of China)
|
Quantum Clone and States Estimation for n-state System
|
4 Pages, No Figure
|
Phys. Lett. A 271 (2000) 31
|
10.1016/S0375-9601(00)00352-2
| null |
quant-ph
| null |
We derive a lower bound for the optimal fidelity for deterministic cloning a
set of n pure states. In connection with states estimation, we obtain a lower
bound about average maximum correct states estimation probability.
|
[
{
"version": "v1",
"created": "Sat, 31 Jul 1999 08:57:22 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Aug 1999 02:55:18 GMT"
},
{
"version": "v3",
"created": "Sat, 22 Jan 2000 08:35:45 GMT"
},
{
"version": "v4",
"created": "Wed, 14 Jun 2000 08:54:58 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Zhang",
"Chuan-Wei",
"",
"University of\n Science and Technology of China"
],
[
"Li",
"Chuan-Feng",
"",
"University of\n Science and Technology of China"
],
[
"Guo",
"Guang-Can",
"",
"University of\n Science and Technology of China"
]
] |
quant-ph/9908004
|
Sougato Bose
|
S. Bose, P. L. Knight, M. B. Plenio, V. Vedral
|
Proposal for teleportation of an atomic state via cavity decay
|
Version to appear in PRL (Dec). Small changes including title
| null |
10.1103/PhysRevLett.83.5158
| null |
quant-ph
| null |
We show how the state of an atom trapped in a cavity can be teleported to a
second atom trapped in a distant cavity simply by detecting photon decays from
the cavities. This is a rare example of a decay mechanism playing a
constructive role in quantum information processing. The scheme is
comparatively easy to implement, requiring only the ability to trap a single
three level atom in a cavity.
|
[
{
"version": "v1",
"created": "Sun, 1 Aug 1999 16:07:21 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Dec 1999 02:31:01 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Bose",
"S.",
""
],
[
"Knight",
"P. L.",
""
],
[
"Plenio",
"M. B.",
""
],
[
"Vedral",
"V.",
""
]
] |
quant-ph/9908005
|
JeongHyeong Park
|
JeongHyeong Park and Dae-Yup Song
|
Berry phase in the simple harmonic oscillator
|
LaTex, 1 figure
| null | null | null |
quant-ph
| null |
Berry phase of simple harmonic oscillator is considered in a general
representation. It is shown that, Berry phase which depends on the choice of
representation can be defined under evolution of the half of period of the
classical motions, as well as under evolution of the period. The Berry phases
do {\em not} depend on the mass or angular frequency of the oscillator. The
driven harmonic oscillator is also considered, and the Berry phase is given in
terms of Fourier coefficients of the external force and parameters which
determine the representation.
|
[
{
"version": "v1",
"created": "Sun, 1 Aug 1999 16:39:26 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Park",
"JeongHyeong",
""
],
[
"Song",
"Dae-Yup",
""
]
] |
quant-ph/9908006
|
Benni Reznik
|
Alonso Botero and Benni Reznik
|
Quantum Communication Protocol Employing Weak Measurements
|
5 pages, Revtex, 1 figure. A second protocol is added, where by a
similar set of weak measurement Alice can send, instead of receiving, a
message to Bob. The security question for the latter protocol is discussed
|
Phys. Rev. A 61, 050301 (R), (2000).
|
10.1103/PhysRevA.61.050301
| null |
quant-ph
| null |
We propose a communication protocol exploiting correlations between two
events with a definite time-ordering: a) the outcome of a {\em weak
measurement} on a spin, and b) the outcome of a subsequent ordinary measurement
on the spin. In our protocol, Alice, first generates a "code" by performing
weak measurements on a sample of N spins.
The sample is sent to Bob, who later performs a post-selection by measuring
the spin along either of two certain directions. The results of the
post-selection define the "key', which he then broadcasts publicly. Using both
her previously generated code and this key, Alice is able to infer the {\em
direction} chosen by Bob in the post-selection. Alternatively, if Alice
broadcasts publicly her code, Bob is able to infer from the code and the key
the direction chosen by Alice for her weak measurement. Two possible
experimental realizations of the protocols are briefly mentioned.
|
[
{
"version": "v1",
"created": "Sun, 1 Aug 1999 23:49:09 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Sep 1999 08:48:05 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Botero",
"Alonso",
""
],
[
"Reznik",
"Benni",
""
]
] |
quant-ph/9908007
|
Jun Ye
|
J. Ye, D. W. Vernooy, H. J. Kimble
|
Trapping of single atoms in cavity QED
|
4 pages, 4 figures
| null |
10.1103/PhysRevLett.83.4987
| null |
quant-ph
| null |
By integrating the techniques of laser cooling and trapping with those of
cavity quantum electrodynamics (QED), single Cesium atoms have been trapped
within the mode of a small, high finesse optical cavity in a regime of strong
coupling. The observed lifetime for individual atoms trapped within the cavity
mode is $\tau \approx 28$ms, and is limited by fluctuations of light forces
arising from the far-detuned intracavity field. This initial realization of
trapped atoms in cavity QED should enable diverse protocols in quantum
information science.
|
[
{
"version": "v1",
"created": "Mon, 2 Aug 1999 00:49:45 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Ye",
"J.",
""
],
[
"Vernooy",
"D. W.",
""
],
[
"Kimble",
"H. J.",
""
]
] |
quant-ph/9908008
|
Erich Joos
|
Erich Joos
|
Elements of Environmental Decoherence
|
Latex, 16 pages. To be published in the proceedings of the Bielefeld
conference on ``Decoherence: Theoretical, Experimental, and Conceptual
Problems", edited by P. Blanchard, D. Giulini, E. Joos, C. Kiefer, and I.-O.
Stamatescu (Springer 1999)
| null | null | null |
quant-ph
| null |
In this contribution I give a brief introduction to the essential concepts
and mechanisms of decoherence by the environment. The emphasis will be not so
much on technical details but rather on conceptual issues and the impact on the
interpretation problem of quantum theory.
|
[
{
"version": "v1",
"created": "Mon, 2 Aug 1999 12:26:36 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Joos",
"Erich",
""
]
] |
quant-ph/9908009
|
Dagomir Kaszlikowski
|
Dagomir Kaszlikowski, Marek Zukowski
|
Bell theorem involving all possible local measurements
| null | null |
10.1103/PhysRevA.61.022114
| null |
quant-ph
| null |
The Bell theorem for a pair of two-state systems in a singlet state is
formulated for the entire range of measurement settings.
|
[
{
"version": "v1",
"created": "Mon, 2 Aug 1999 16:44:35 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Kaszlikowski",
"Dagomir",
""
],
[
"Zukowski",
"Marek",
""
]
] |
quant-ph/9908010
|
Daniel Gottesman
|
Daniel Gottesman and Isaac L. Chuang
|
Quantum Teleportation is a Universal Computational Primitive
|
6 pages, REVTeX, 6 epsf figures
|
Nature 402, 390-393 (1999)
|
10.1038/46503
| null |
quant-ph
| null |
We present a method to create a variety of interesting gates by teleporting
quantum bits through special entangled states. This allows, for instance, the
construction of a quantum computer based on just single qubit operations, Bell
measurements, and GHZ states. We also present straightforward constructions of
a wide variety of fault-tolerant quantum gates.
|
[
{
"version": "v1",
"created": "Mon, 2 Aug 1999 21:36:39 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Gottesman",
"Daniel",
""
],
[
"Chuang",
"Isaac L.",
""
]
] |
quant-ph/9908011
|
Ole Steuernagel
|
Ole Steuernagel
|
Uncertainty is complementary to Complementarity
|
3 pages, 2 figures
| null | null | null |
quant-ph
| null |
For any ideal two-path interferometer it is shown that the wave-particle
duality of quantum mechanics implies Heisenberg's uncertainty relation and vice
versa. It is conjectured that complementarity and uncertainty are two aspects
of the same general principle.
|
[
{
"version": "v1",
"created": "Tue, 3 Aug 1999 12:55:41 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Steuernagel",
"Ole",
""
]
] |
quant-ph/9908012
|
Ching-Hua Tseng
|
C. H. Tseng, S. Somaroo, Y. Sharf, E. Knill, R. Laflamme, T. F. Havel,
D. G. Cory
|
Quantum simulation of a three-body interaction Hamiltonian on an NMR
quantum computer
|
5 pages, 1 figure
| null |
10.1103/PhysRevA.61.012302
| null |
quant-ph
| null |
Extensions of average Hamiltonian theory to quantum computation permit the
design of arbitrary Hamiltonians, allowing rotations throughout a large Hilbert
space. In this way, the kinematics and dynamics of any quantum system may be
simulated by a quantum computer. A basis mapping between the systems dictates
the average Hamiltonian in the quantum computer needed to implement the desired
Hamiltonian in the simulated system. The flexibility of the procedure is
illustrated with NMR on 13-C labelled Alanine by creating the non-physical
Hamiltonian ZZZ corresponding to a three body interaction.
|
[
{
"version": "v1",
"created": "Tue, 3 Aug 1999 13:40:33 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Tseng",
"C. H.",
""
],
[
"Somaroo",
"S.",
""
],
[
"Sharf",
"Y.",
""
],
[
"Knill",
"E.",
""
],
[
"Laflamme",
"R.",
""
],
[
"Havel",
"T. F.",
""
],
[
"Cory",
"D. G.",
""
]
] |
quant-ph/9908013
|
Abel Camacho Quintana
|
A. Camacho (Astrophysikalisches Institut Potsdam)
|
Measurement-induced interference in an inhomogeneous gravitational field
|
15 pages, accepted in Physics Letters A
|
Phys.Lett. A262 (1999) 110-120
|
10.1016/S0375-9601(99)00565-4
| null |
quant-ph gr-qc
| null |
A very interesting quantum mechanical effect is the emergence of
gravity-induced interference, which has already been detected. This effect also
shows us that gravity is at the quantum level not a purely geometric effect,
the mass of the employed particles appears explicitly in the interference
expression. In this work we will generalize some previous results. It will be
shown that the introduction of a second order approximation in the propagator
of a particle, immersed in the Earth's gravitational field, and whose
coordinates are being continuously monitored, allows us to include, in the
corresponding complex oscillator, a frequency which now depends on the geometry
of the source of the gravitational field, a fact that is absent in the case of
a homogeneous field. Using this propagator we will analyze the interference
pattern of two particle beams whose coordinates are being continuously
monitored. We will compare our results againt the case of a homogeneous field,
and also against the measurement ouputs of the Colella, Overhauser, and Werner
experiment, and find that the difference in the dependence upon the geometry of
the source of the gravitational field could render detectable differences in
their respective measurement outputs.
|
[
{
"version": "v1",
"created": "Tue, 3 Aug 1999 17:04:22 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Camacho",
"A.",
"",
"Astrophysikalisches Institut Potsdam"
]
] |
quant-ph/9908014
|
Jan Govaerts
|
Jan Govaerts (Catholic Univ. Louvain) and Victor M. Villanueva (Univ.
Michoacan, Mexico)
|
Topology Classes of Flat U(1) Bundles and Diffeomorphic Covariant
Representations of the Heisenberg Algebra
|
22 pages, no figures, plain LaTeX file; changes only in details of
affiliation and financial support
|
Int.J.Mod.Phys. A15 (2000) 4903-4932
|
10.1142/S0217751X00002846
| null |
quant-ph hep-th math-ph math.MP
| null |
The general construction of self-adjoint configuration space representations
of the Heisenberg algebra over an arbitrary manifold is considered. All such
inequivalent representations are parametrised in terms of the topology classes
of flat U(1) bundles over the configuration space manifold. In the case of
Riemannian manifolds, these representations are also manifestly diffeomorphic
covariant. The general discussion, illustrated by some simple examples in non
relativistic quantum mechanics, is of particular relevance to systems whose
configuration space is parametrised by curvilinear coordinates or is not simply
connected, which thus include for instance the modular spaces of theories of
non abelian gauge fields and gravity.
|
[
{
"version": "v1",
"created": "Wed, 4 Aug 1999 09:13:37 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Sep 1999 09:14:02 GMT"
}
] | 2016-12-28T00:00:00 |
[
[
"Govaerts",
"Jan",
"",
"Catholic Univ. Louvain"
],
[
"Villanueva",
"Victor M.",
"",
"Univ.\n Michoacan, Mexico"
]
] |
quant-ph/9908015
|
Castagnoli Giuseppe
|
Giuseppe Castagnoli, Dalida Monti, and Alexander Sergienko
|
Performing Quantum Measurement in Suitably Entangled States Originates
the Quantum Computation Speed Up
|
22 pages, RevTex, 1 PostScript file with figures. Some comments might
indicate ineffective communication of the former version. The description of
the mechanism of the quantum speed-up should now be clearer. An Overview of a
few pages has been provided
| null | null | null |
quant-ph
| null |
We provide a justification of the quantum speed-up based on the complementary
roles played by the reversible preparation of an entangled state before
measurement and by the final measurement action.
|
[
{
"version": "v1",
"created": "Wed, 4 Aug 1999 09:56:35 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Feb 2000 13:31:24 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Castagnoli",
"Giuseppe",
""
],
[
"Monti",
"Dalida",
""
],
[
"Sergienko",
"Alexander",
""
]
] |
quant-ph/9908016
|
Yeranuhi Hakobyan
|
Ye. Hakobyan, S. Ter-Antonyan, V. Ter-Antonyan
|
Quantum Parabolic Sombrero
|
10 pages, LaTex, 6 figures (eps). accepted in Phys. Lett. A
|
Phys.Lett. A264 (2000) 434-439
|
10.1016/S0375-9601(99)00832-4
| null |
quant-ph hep-th math-ph math.MP
| null |
We have discussed the energy levels and probability distribution density for
a quantum particle placed in the two-dimensional sombrero-shaped potential
$V(\rho,\rho_0)=\mu\omega^2|\rho^2-\rho_0^2|/2$.
|
[
{
"version": "v1",
"created": "Wed, 4 Aug 1999 12:52:04 GMT"
},
{
"version": "v2",
"created": "Sat, 27 Nov 1999 11:41:33 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Hakobyan",
"Ye.",
""
],
[
"Ter-Antonyan",
"S.",
""
],
[
"Ter-Antonyan",
"V.",
""
]
] |
quant-ph/9908017
|
Dr. Arun Kumar Pati
|
Arun Kumar Pati
|
Probabilistic exact cloning and probabilistic no-signalling
|
Latex file, 6 pages, minor corrections
| null |
10.1016/S0375-9601(00)00281-4
| null |
quant-ph
| null |
We show that non-local resources cannot be used for probabilistic signalling
even if one can produce exact clones with the help of a probabilistic quantum
cloning machine (PQCM). We show that PQCM cannot help to distinguish two
statistical mixtures at a remote location. Thus quantum theory rules out the
possibility of sending superluminal signals not only deterministically but also
probabilistically. We give a bound on the success probability of producing
multiple clones in an entangled system.
|
[
{
"version": "v1",
"created": "Wed, 4 Aug 1999 13:17:57 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Aug 1999 11:39:28 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Pati",
"Arun Kumar",
""
]
] |
quant-ph/9908018
|
Michael Wilkinson
|
Michael Wilkinson and Michael A. Morgan
|
Non-adiabatic transitions in multi-level systems
|
25 pages RevTeX, 9 figures and 4 tables as Postscipt files
| null |
10.1103/PhysRevA.61.062104
| null |
quant-ph
| null |
In a quantum system with a smoothly and slowly varying Hamiltonian, which
approaches a constant operator at times $t\to \pm \infty$, the transition
probabilities between adiabatic states are exponentially small. They are
characterized by an exponent that depends on a phase integral along a path
around a set of branch points connecting the energy level surfaces in complex
time. Only certain sequences of branch points contribute. We propose that these
sequences are determined by a topological rule involving the Stokes lines
attached to the branch points. Our hypothesis is supported by theoretical
arguments and results of numerical experiments.
|
[
{
"version": "v1",
"created": "Wed, 4 Aug 1999 14:20:33 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Wilkinson",
"Michael",
""
],
[
"Morgan",
"Michael A.",
""
]
] |
quant-ph/9908019
|
Guy Potvin
|
Guy Potvin (Defense Research Establishment Valcartier)
|
Dualist interpretation of quantum mechanics
|
17 pages, no figures, RevTex, corrected typos and Eq. (21) (but does
not affect conclusions). Also, discusses some old ideas in greater detail and
introduces new ones, references added, DREV website: http://www.drev.dnd.ca/
| null | null | null |
quant-ph cond-mat.stat-mech
| null |
An interpretation of quantum mechanics is proposed which augments the
stochastic pilot-wave model, introduced by Nelson [E. Nelson, Phys. Rev., 150,
1079 (1966)], with a dual guidance condition. Namely, in addition to the
stochastic guidance condition which describes how the wave controls the
particle (wave-to-particle guidance condition), we introduce another stochastic
guidance condition describing how the particle guides the wave
(particle-to-wave guidance condition). We therefore introduce an
action-reaction principle in the pilot-wave formulation of quantum mechanics.
The particle-to-wave guidance condition takes the form of spontaneous
transitions of the wavefunction that are Poisson distributed in time. The
wavefunction selected by the transition is influenced by its likelyhood with
respect to the particle position, as well as certain conservation constraints.
It is shown that the stochastic particle-to-wave guidance condition reproduces
certain aspects of the spontaneous localization model of Ghirardi, Rimini and
Weber [G. C. Ghirardi, A. Rimini and T. Weber, Phys. Rev. D, 34, 470 (1986)],
and of Milburn's intrinsic decoherence model [G. J. Milburn, Phys. Rev. A, 44,
5401 (1991)], while avoiding some of the difficulties associated with them. The
macroscopic limit of the dualist interpretation is analyzed for the case of a
free body. Possible improvements of this interpretation are discussed.
|
[
{
"version": "v1",
"created": "Wed, 4 Aug 1999 16:54:53 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Aug 1999 18:32:09 GMT"
},
{
"version": "v3",
"created": "Wed, 1 Dec 1999 16:04:43 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Potvin",
"Guy",
"",
"Defense Research Establishment Valcartier"
]
] |
quant-ph/9908020
|
Anil K. Patnaik
|
Anil K. Patnaik (Physical Research Laboratory, Ahmedabad, India) and
G. S. Agarwal (Physical Research Laboratory, Ahmedabad, India and
Max-Plank-Institut f\"ur Quantenoptik, Garching, Germany)
|
Laser Field Induced Birefringence and Enhancement of Magneto-optical
Rotation
|
9 pages including 4 Figures
|
Optics Commun. vol. 179, pg. 97-106 (2000)
|
10.1016/S0030-4018(99)00530-1
| null |
quant-ph
| null |
An initially isotropic medium, when subjected to either a magnetic field or a
coherent field, can induce anisotropy in the medium and can cause the
polarization of a probe field to rotate. Therefore the rotation of probe
polarization, due to magnetic field alone, can be controlled efficiently with
the use of a coherent control field. We demonstrate this enhancement of the
magneto-optical rotation (MOR) of a linearly polarized light, by doing detailed
calculations on a system with relevant transitions $j=0\leftrightarrow
j=1\leftrightarrow j=0$.
|
[
{
"version": "v1",
"created": "Wed, 4 Aug 1999 18:00:26 GMT"
}
] | 2016-08-15T00:00:00 |
[
[
"Patnaik",
"Anil K.",
"",
"Physical Research Laboratory, Ahmedabad, India"
],
[
"Agarwal",
"G. S.",
"",
"Physical Research Laboratory, Ahmedabad, India and\n Max-Plank-Institut für Quantenoptik, Garching, Germany"
]
] |
quant-ph/9908021
|
Tetsufumi Tanamoto
|
Tetsufumi Tanamoto (Toshiba Corporation)
|
Quantum gates by coupled quantum dots and measurement procedure in Si
MOSFET
|
3 pages, 2 figures, use revtex.sty. 'The Eleventh International
Conference on Nonequilibrium Carrier Dynamics in Semiconductors
(HCIS-11)',July 19-23, 1999
|
Physica B 272 (1999) 45
|
10.1016/S0921-4526(99)00344-0
| null |
quant-ph
| null |
We investigated the quantum gates of coupled quantum dots, theoretically,
when charging effects can be observed. We have shown that the charged states in
the qubits can be observed by the channel current of the MOSFET structure.
|
[
{
"version": "v1",
"created": "Thu, 5 Aug 1999 02:18:29 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Tanamoto",
"Tetsufumi",
"",
"Toshiba Corporation"
]
] |
quant-ph/9908022
|
Alberto Carlini
|
A. Carlini and A. Hosoya
|
Carmichael Numbers on a Quantum Computer
|
7 pages, Latex/REVTEX file
| null | null |
TIT/HEP-427/COSMO-95
|
quant-ph
| null |
We present a quantum probabilistic algorithm which tests with a polynomial
computational complexity whether a given composite number is of the Carmichael
type. We also suggest a quantum algorithm which could verify a conjecture by
Pomerance, Selfridge and Wagstaff concerning the asymptotic distribution of
Carmichael numbers smaller than a given integer.
|
[
{
"version": "v1",
"created": "Thu, 5 Aug 1999 09:13:22 GMT"
}
] | 2009-09-25T00:00:00 |
[
[
"Carlini",
"A.",
""
],
[
"Hosoya",
"A.",
""
]
] |
quant-ph/9908023
|
Mladen Pavicic
|
Harry Paul and Mladen Pavicic
|
Nonclassical interaction-free detection of objects in a monolithic
total-internal-reflection resonator
|
RevTeX, 13 pages, 4 ps figures, author's www:
http://m3k.grad.hr/pavicic
|
J. Opt. Soc. Am. B, 14 (1997) 1275-1279
|
10.1364/JOSAB.14.001275
| null |
quant-ph
| null |
We show that with an efficiency exceeding 99% one can use a monolithic
total-internal-reflection resonator in order to ascertain the presence of an
object without transferring a quantum of energy to it. We also propose an
experiment on the probabilistic meaning of the electric field that contains
only a very few photons.
|
[
{
"version": "v1",
"created": "Thu, 5 Aug 1999 19:48:36 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Paul",
"Harry",
""
],
[
"Pavicic",
"Mladen",
""
]
] |
quant-ph/9908024
|
Mladen Pavicic
|
Mladen Pavicic
|
Spin-correlated interferometry with beam splitters: preselection of
spin-correlated photons
|
RevTeX, 19 pages, 3 ps figures, author's www:
http://m3k.grad.hr/pavicic
|
J. Opt. Soc. Am. B, 12 (1995) 821-828
|
10.1364/JOSAB.12.000821
| null |
quant-ph
| null |
A nonclassical feature of the fourth-order interference at a beam splitter,
that genuine photon spin singlets are emitted in predetermined directions even
when incident photons are unpolarized, has been used in a proposal for an
experiment that imposes quantum spin correlation on truly independent photons.
In the experiment, two photons from two such singlets interfere at a beam
splitter, and as a result the other two photons - which nowhere interacted and
whose paths nowhere crossed - exhibit a 100% correlation in polarization, even
when no polarization has been measured in the first two photons. The propsed
experiment permits closure of the remaining loopholes in the Bell theorem proof
and reveals the quantum nonlocality as a property of selection, and pioneers an
experimental procedure for exact preparation of unequal superposition.
|
[
{
"version": "v1",
"created": "Thu, 5 Aug 1999 20:56:23 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Pavicic",
"Mladen",
""
]
] |
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