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| versions
list | update_date
timestamp[s] | authors_parsed
list |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
quant-ph/9911116
|
Miloslav Znojil
|
M. Znojil
|
Shape invariant potentials with PT symmetry
|
version 1: 5 pages, Latex (already published: J. Phys. A: Math. Gen.
33 (2000) L61-2; version 2: 28 pages of a review-type update prepared as a
text of a proposed seminar (ATOMKI, Debrecen, presumably this week)
|
J. Phys. A: Math. Gen. 33 (2000) L61-2
|
10.1088/0305-4470/33/7/102
| null |
quant-ph
| null |
Suitable complexification of the well known solvable oscillators in one
dimension is shown to give the four exactly solvable models which combine the
shape- and PT-invariance.
In version v2 the result is extended of the s-wave shape-invariant forces.
|
[
{
"version": "v1",
"created": "Mon, 29 Nov 1999 16:01:15 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Mar 2000 08:18:45 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Znojil",
"M.",
""
]
] |
quant-ph/9911117
|
Barbara M. Terhal
|
Barbara M. Terhal and Pawel Horodecki
|
A Schmidt number for density matrices
|
5 pages RevTex, 1 typo in Proof Lemma 1 corrected
|
Phys. Rev. A Rapid Communications Vol.61,040301 (2000)
|
10.1103/PhysRevA.61.040301
| null |
quant-ph
| null |
We introduce the notion of a Schmidt number of a bipartite density matrix,
characterizing the minimum Schmidt rank of the pure states that are needed to
construct the density matrix. We prove that Schmidt number is nonincreasing
under local quantum operations and classical communication. We show that
$k$-positive maps witness Schmidt number, in the same way that positive maps
witness entanglement. We show that the family of states which is made from
mixing the completely mixed state and a maximally entangled state have
increasing Schmidt number depending on the amount of maximally entangled state
that is mixed in. We show that Schmidt number {\it does not necessarily
increase} when taking tensor copies of a density matrix $\rho$; we give an
example of a density matrix for which the Schmidt numbers of $\rho$ and $\rho
\otimes \rho$ are both 2.
|
[
{
"version": "v1",
"created": "Mon, 29 Nov 1999 19:05:47 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Dec 1999 17:03:37 GMT"
},
{
"version": "v3",
"created": "Mon, 13 Dec 1999 20:38:17 GMT"
},
{
"version": "v4",
"created": "Mon, 6 Mar 2000 21:51:05 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Terhal",
"Barbara M.",
""
],
[
"Horodecki",
"Pawel",
""
]
] |
quant-ph/9911118
|
Richard L. Hall
|
Richard L. Hall and Nasser Saad
|
Variational analysis for a generalized spiked harmonic oscillator
|
15 pages, 1 figure
|
J. Phys. A 33, 569-578 (2000)
|
10.1088/0305-4470/33/3/310
|
CUQM-76
|
quant-ph math-ph math.MP
| null |
A variational analysis is presented for the generalized spiked harmonic
oscillator Hamiltonian operator H, where H = -(d/dx)^2 + Bx^2+ A/x^2 +
lambda/x^alpha, and alpha and lambda are real positive parameters. The
formalism makes use of a basis provided by exact solutions of Schroedinger's
equation for the Gol'dman and Krivchenkov Hamiltonian (alpha = 2), and the
corresponding matrix elements that were previously found. For all the discrete
eigenvalues the method provides bounds which improve as the dimension of the
basis set is increased. Extension to the N-dimensional case in arbitrary
angular-momentum subspaces is also presented. By minimizing over the free
parameter A, we are able to reduce substantially the number of basis functions
needed for a given accuracy.
|
[
{
"version": "v1",
"created": "Mon, 29 Nov 1999 19:16:04 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Hall",
"Richard L.",
""
],
[
"Saad",
"Nasser",
""
]
] |
quant-ph/9911119
|
Martin Plenio
|
S. Virmani and M. B. Plenio
|
Ordering States with Entanglement Measures
|
6 pages, minor changes, references updated, all conclusions
unchanged, now accepted for publication
|
Physics Letters A 268, 31 (2000)
|
10.1016/S0375-9601(00)00157-2
| null |
quant-ph
| null |
We demonstrate that all good asymptotic entanglement measures are either
identical or place a different ordering on the set of all quantum states.
|
[
{
"version": "v1",
"created": "Mon, 29 Nov 1999 19:18:25 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Feb 2000 18:29:32 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Virmani",
"S.",
""
],
[
"Plenio",
"M. B.",
""
]
] |
quant-ph/9911120
|
MinXin Huang
|
Minxin Huang, Yongde Zhang, Guang Hou (University of Science and
Technology of China)
|
Classical Capacity of A Quantum Multiple Access Channel
|
Latex
|
Phys. Rev. A, Volume 62, 052106 (2000)
|
10.1103/PhysRevA.62.052106
| null |
quant-ph
| null |
We consider the transmission of classical information over a quantum channel
by two senders. The channel capacity region is shown to be a convex hull bound
by the Von Neumann entropy and the conditional Von Neumann entropy. We discuss
some possible applications of our result. We also show that our scheme allows a
reasonable distribution of channel capacity over two senders.
|
[
{
"version": "v1",
"created": "Tue, 30 Nov 1999 10:16:36 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Dec 1999 13:20:59 GMT"
},
{
"version": "v3",
"created": "Thu, 9 Dec 1999 07:07:39 GMT"
},
{
"version": "v4",
"created": "Sun, 14 May 2000 03:12:49 GMT"
},
{
"version": "v5",
"created": "Mon, 6 Nov 2000 18:48:51 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Huang",
"Minxin",
"",
"University of Science and\n Technology of China"
],
[
"Zhang",
"Yongde",
"",
"University of Science and\n Technology of China"
],
[
"Hou",
"Guang",
"",
"University of Science and\n Technology of China"
]
] |
quant-ph/9911121
|
Ariel Gordon
|
A. Gordon and J. E. Avron
|
Born-Oppenheimer Approximation near Level Crossing
|
8 pages, 1 figure, Letter
|
Phys. Rev. Let. 85, 34 (2000)
|
10.1103/PhysRevLett.85.34
| null |
quant-ph math-ph math.MP physics.chem-ph
| null |
We consider the Born-Oppenheimer problem near conical intersection in two
dimensions. For energies close to the crossing energy we describe the wave
function near an isotropic crossing and show that it is related to generalized
hypergeometric functions 0F3. This function is to a conical intersection what
the Airy function is to a classical turning point. As an application we
calculate the anomalous Zeeman shift of vibrational levels near a crossing.
|
[
{
"version": "v1",
"created": "Tue, 30 Nov 1999 13:37:00 GMT"
},
{
"version": "v2",
"created": "Sun, 27 Feb 2000 11:00:30 GMT"
},
{
"version": "v3",
"created": "Tue, 2 May 2000 10:03:34 GMT"
},
{
"version": "v4",
"created": "Mon, 29 May 2000 07:22:59 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Gordon",
"A.",
""
],
[
"Avron",
"J. E.",
""
]
] |
quant-ph/9911122
|
Sergio de Filippo
|
Sergio De Filippo
|
Quantum states as generalized classical ensembles
|
Only craziness I am ashamed about
| null | null | null |
quant-ph cond-mat.dis-nn hep-th
| null |
Only craziness I am ashamed about.
|
[
{
"version": "v1",
"created": "Tue, 30 Nov 1999 18:29:44 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Dec 1999 10:15:54 GMT"
},
{
"version": "v3",
"created": "Mon, 6 Dec 1999 20:08:24 GMT"
},
{
"version": "v4",
"created": "Sat, 18 Dec 1999 20:35:42 GMT"
},
{
"version": "v5",
"created": "Mon, 26 Sep 2011 17:02:52 GMT"
}
] | 2011-09-27T00:00:00 |
[
[
"De Filippo",
"Sergio",
""
]
] |
quant-ph/9911123
|
John Henry Reina
|
John H. Reina (1), Luis Quiroga (2), and Neil F. Johnson (1) ((1)
Oxford University, UK, (2) Universidad de los Andes)
|
Quantum entanglement and information processing via excitons in
optically-driven quantum dots
|
3 separate PostScript Figures + 7 pages. Typos corrected. Minor
changes added. This updated version is to appear in PRA
|
Phys. Rev. A 62, 12305 (2000)
|
10.1103/PhysRevA.62.012305
| null |
quant-ph cond-mat.mes-hall
| null |
We show how optically-driven coupled quantum dots can be used to prepare
maximally entangled Bell and Greenberger-Horne-Zeilinger states. Manipulation
of the strength and duration of the selective light-pulses needed for producing
these highly entangled states provides us with crucial elements for the
processing of solid-state based quantum information. Theoretical predictions
suggest that several hundred single quantum bit rotations and Controlled-Not
gates could be performed before decoherence of the excitonic states takes
place.
|
[
{
"version": "v1",
"created": "Tue, 30 Nov 1999 18:36:36 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Mar 2000 23:03:40 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Reina",
"John H.",
""
],
[
"Quiroga",
"Luis",
""
],
[
"Johnson",
"Neil F.",
""
]
] |
quant-ph/9911124
|
Richard Cleve
|
Richard Cleve (U of Calgary)
|
The query complexity of order-finding
|
9 pages, LaTeX, three figures
| null | null | null |
quant-ph
| null |
We consider the problem where P is an unknown permutation on {0,1,...,2^n -
1}, y is an element of {0,1,...,2^n - 1}, and the goal is to determine the
minimum r > 0 such that P^r(y) = y (where P^r is P composed with itself r
times). Information about P is available only via queries that yield P^x(y)
from any x in {0,1,...,2^m - 1} and y in {0,1,...,2^n - 1} (where m is
polynomial in n). The main resource under consideration is the number of these
queries. We show that the number of queries necessary to solve the problem in
the classical probabilistic bounded-error model is exponential in n. This
contrasts sharply with the quantum bounded-error model, where a constant number
of queries suffices.
|
[
{
"version": "v1",
"created": "Tue, 30 Nov 1999 22:42:10 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Cleve",
"Richard",
"",
"U of Calgary"
]
] |
quant-ph/9912001
|
Lov K. Grover
|
Lov K. Grover (Bell Labs, Murray Hill NJ)
|
Rapid sampling through quantum computing
|
The paper has been rewritten. It is to be presented at STOC '00 in
May '00
| null | null | null |
quant-ph
| null |
This paper extends the quantum search class of algorithms to the multiple
solution case. It is shown that, like the basic search algorithm, these too can
be represented as a rotation in an appropriately defined two dimensional vector
space. This yields new applications - an algorithm is presented that can create
an arbitrarily specified quantum superposition on a space of size N in
O(sqrt(N)) steps. By making a measurement on this superposition, it is possible
to obtain a sample according to an arbitrarily specified classical probability
distribution in O(sqrt(N)) steps. A classical algorithm would need O(N) steps.
|
[
{
"version": "v1",
"created": "Wed, 1 Dec 1999 03:14:17 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Feb 2000 17:04:11 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Grover",
"Lov K.",
"",
"Bell Labs, Murray Hill NJ"
]
] |
quant-ph/9912002
|
Daniel R. Terno
|
Daniel R.Terno
|
Comment on `Counterfactual entanglement and non-local correlations in
separable states'
|
RevTeX, 3 pages
|
Phys. Rev. A 63 (2001) 016101
|
10.1103/PhysRevA.63.016101
| null |
quant-ph
| null |
The arguments of Cohen [Phys. Rev. A {\bf 60}, 80 (1999)] against the
`ignorance interpretation' of mixed states are questioned. The physical
arguments are shown to be inconsistent and the supporting example illustrates
the opposite of the original statement. The operational difference between two
possible definitions of mixed states is exposed and the inadequacy of one of
them is stressed.
|
[
{
"version": "v1",
"created": "Wed, 1 Dec 1999 13:55:56 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Terno",
"Daniel R.",
""
]
] |
quant-ph/9912003
|
Shawn Pethel
|
C. M. Bowden, and S. D. Pethel
|
Novel Scheme for Universal Quantum Computation
|
5 figures
| null | null | null |
quant-ph
| null |
A scenario for realization of a quantum computer is proposed consisting of
spatially distributed q-bits fabricated in a host structure where nuclear
spin-spin coupling is mediated by laser pulse controlled electron-nuclear
transferred hyperfine (superhyperfine) Fermi contact interaction. Operations
illustrating entanglement, nonlocality, and quantum control logic operations
are presented and discussed. The notion of universality of quantum computation
is introduced and the irreducible conditions are presented. It is demonstrated
that the proposed generic scenario for realization of a quantum computer
fulfills these conditions.
|
[
{
"version": "v1",
"created": "Wed, 1 Dec 1999 14:56:40 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Bowden",
"C. M.",
""
],
[
"Pethel",
"S. D.",
""
]
] |
quant-ph/9912004
|
Almut Beige
|
Almut Beige, Daniel Braun and Peter L. Knight
|
Driving Atoms Into Decoherence-Free States
|
12 pages, 3 figures, more detailed version, accepted for publication
in New Journal of Physics, see http://www.njp.org/
|
New J. Phys. 2, 22 (2000)
|
10.1088/1367-2630/2/1/322
|
01/12/99
|
quant-ph
| null |
We describe the decoherence-free subspace of N atoms in a cavity, in which
decoherence due to the leakage of photons through the cavity mirrors is
suppressed. We show how the states of the subspace can be entangled with the
help of weak laser pulses, using the high decay rate of the cavity field and
strong coupling between the atoms and the resonator mode. The atoms remain
decoherence-free with a probability which can, in principle, be arbitrarily
close to unity.
|
[
{
"version": "v1",
"created": "Wed, 1 Dec 1999 16:18:36 GMT"
},
{
"version": "v2",
"created": "Fri, 30 Jun 2000 17:17:17 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Beige",
"Almut",
""
],
[
"Braun",
"Daniel",
""
],
[
"Knight",
"Peter L.",
""
]
] |
quant-ph/9912005
|
L. F. Santos
|
L. F. Santos and C. O. Escobar
|
Convergences in the Measurement Problem in Quantum Mechanics
|
7 pages, no figures
| null | null | null |
quant-ph
| null |
This paper presents arguments purporting to show that von Neumann's
description of the measurement process in quantum mechanics has a modern day
version in the decoherence approach. We claim that this approach and the de
Broglie-Bohm theory emerges from Bohr's interpretation and are therefore
obliged to deal with some obscures ideas which were antecipated, explicitly or
implicitly and carefully circumvented, by Bohr.
|
[
{
"version": "v1",
"created": "Wed, 1 Dec 1999 16:42:39 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Santos",
"L. F.",
""
],
[
"Escobar",
"C. O.",
""
]
] |
quant-ph/9912006
|
Waldemar Puszkarz
|
Waldemar Puszkarz
|
On the Staruszkiewicz Modification of the Schroedinger Equation
|
Latex, 16 pages
| null | null | null |
quant-ph
| null |
We discuss Staruszkiewicz's nonlinear modification of the Schr\"{o}dinger
equation. It is pointed out that the expression for the energy functional for
this modification is not unique as the field-theoretical definition of energy
does not coincide with the quantum-mechanical one. As a result, this
modification can be formulated in three different ways depending on which
physically relevant properties one aims to preserve. Some nonstationary
one-dimensional solutions for suitably chosen potentials, including a KdV
soliton, are presented, and the question of finding stationary solutions is
also discussed. The analysis of physical and mathematical features of the
modification leads to the conclusion that the Staruszkiewicz modification is a
very subtle modification of the fundamental equation of quantum mechanics.
|
[
{
"version": "v1",
"created": "Thu, 2 Dec 1999 02:13:51 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Puszkarz",
"Waldemar",
""
]
] |
quant-ph/9912007
|
L. F. Santos
|
L. F. Santos and C. O. Escobar
|
Burgers Turbulence and the Continuous Spontaneous Localization Model
|
15 pages, 2 figures
| null | null | null |
quant-ph chao-dyn nlin.CD
| null |
There is a striking convergence between Burgers turbulence and the continuous
spontaneous localization [CSL] model of quantum mechanics. In this paper, we
exploit this analogy showing the similarities in the physics of these two
apparently unrelated problems. It is hoped that the kind of analogy we
introduce here may lead to important developments in both areas.
|
[
{
"version": "v1",
"created": "Thu, 2 Dec 1999 15:47:44 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Santos",
"L. F.",
""
],
[
"Escobar",
"C. O.",
""
]
] |
quant-ph/9912008
|
Stefano Mancini
|
S. Mancini (Dip. Fisica, Univ. Milano, Italy), A. M. Martins (Centro
de Fisica de Plasmas, IST Lisboa, Portugal), P. Tombesi (Dip. Matematica e
Fisica, Univ. Camerino, Italy)
|
Quantum Logic with a Single Trapped Electron
|
7 Pages, REVTeX, No Figures, To appear in Phys. Rev. A
|
Phys. Rev. A 61, 012303 (2000).
|
10.1103/PhysRevA.61.012303
| null |
quant-ph
| null |
We propose the use of a trapped electron to implement quantum logic
operations. The fundamental controlled-NOT gate is shown to be feasible. The
two quantum bits are stored in the internal and external (motional) degrees of
freedom.
|
[
{
"version": "v1",
"created": "Thu, 2 Dec 1999 16:02:12 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Mancini",
"S.",
"",
"Dip. Fisica, Univ. Milano, Italy"
],
[
"Martins",
"A. M.",
"",
"Centro\n de Fisica de Plasmas, IST Lisboa, Portugal"
],
[
"Tombesi",
"P.",
"",
"Dip. Matematica e\n Fisica, Univ. Camerino, Italy"
]
] |
quant-ph/9912009
|
Hoi-Kwong Lo
|
Hoi-Kwong Lo (MagiQ Technologies, Inc., New York, New York)
|
Classical Communication Cost in Distributed Quantum Information
Processing - A generalization of Quantum Communication Complexity
|
Revised Version. Accepted on March 31 for publication in Physical
Review A. Proof of Theorem 3 clarified. A Proviso added to the statement of
Conjecture 4. Related results on randomization and private quantum channel
noted
| null |
10.1103/PhysRevA.62.012313
| null |
quant-ph
| null |
We study the amount of classical communication needed for distributed quantum
information processing. In particular, we introduce the concept of "remote
preparation" of a quantum state. Given an ensemble of states, Alice's task is
to help Bob in a distant laboratory to prepare a state of her choice. We find
several examples of an ensemble with an entropy S where the remote preparation
can be done with a communication cost lower than the amount (2S) required by
standard teleportation. We conjecture that, for an arbitrary N-dimensional pure
state, its remote preparation requires 2log_2 N bits of classical
communication, as in standard teleportation.
|
[
{
"version": "v1",
"created": "Thu, 2 Dec 1999 20:25:17 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Apr 2000 21:33:16 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Lo",
"Hoi-Kwong",
"",
"MagiQ Technologies, Inc., New York, New York"
]
] |
quant-ph/9912010
|
Ignacio Cirac
|
B. Kraus, J. I. Cirac, S. Karnas, and M. Lewenstein
|
Separability in 2xN composite quantum systems
|
Extended version of quant-ph/9903012 with new results. 11 pages
|
Phys.Rev.A 61, 062302 (2000)
|
10.1103/PhysRevA.61.062302
| null |
quant-ph
| null |
We analyze the separability properties of density operators supported on
$\C^2\otimes \C^N$ whose partial transposes are positive operators. We show
that if the rank of $\rho$ equals N then it is separable, and that bound
entangled states have rank larger than N. We also give a separability criterion
for a generic density operator such that the sum of its rank and the one of its
partial transpose does not exceed 3N. If it exceeds this number we show that
one can subtract product vectors until decreasing it to 3N, while keeping the
positivity of $\rho$ and its partial transpose. This automatically gives us a
sufficient criterion for separability for general density operators. We also
prove that all density operators that remain invariant after partial
transposition with respect to the first system are separable.
|
[
{
"version": "v1",
"created": "Thu, 2 Dec 1999 18:16:35 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Kraus",
"B.",
""
],
[
"Cirac",
"J. I.",
""
],
[
"Karnas",
"S.",
""
],
[
"Lewenstein",
"M.",
""
]
] |
quant-ph/9912011
|
Hoi-Kwong Lo
|
Hoi-Kwong Lo (MagiQ Technologies Inc., New York, New York)
|
Will Quantum Cryptography ever become a successful technology in the
marketplace?
|
6 pages, RevTex, two-column format
|
A substantially shortened and edited version appeared in Physics
World, June 2000, p. 17
| null | null |
quant-ph
| null |
We assess the potential of quantum cryptography as a technology. We highlight
the fact that academia and real world have rather different perspectives and
interests. Then, we describe the various real life forces (different types of
users, vendors of crypto-systems, conventional cryptographers, governments)
behind the decision of the adoption (or rejection) of quantum cryptography and
their different interests. Various roadblocks to the widespread application of
quantum cryptography are discussed. Those roadblocks can be fundamental,
technological, psychological, commercial or political and many of them have
nothing to do with the security of quantum key distribution. We argue that the
future success of quantum cryptography as a technology in the marketplace lies
in our ability to appreciate and to overcome those roadblocks and to answer
real world criticisms on the subject.
|
[
{
"version": "v1",
"created": "Thu, 2 Dec 1999 21:18:29 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Lo",
"Hoi-Kwong",
"",
"MagiQ Technologies Inc., New York, New York"
]
] |
quant-ph/9912012
|
Andr\'es Sicard
|
Andr\'es Sicard and Mario V\'elez
|
Some relations between quantum Turing machines and Turing machines
|
LaTeX, 6 pages. In previous version, we have some problems with
bibliographic references
| null | null | null |
quant-ph
| null |
For quantum Turing machines we present three elements: Its components, its
time evolution operator and its local transition function. The components are
related with the components of deterministic Turing machines, the time
evolution operator is related with the evolution of reversible Turing machines
and the local transition function is related with the transition function of
probabilistic and reversible Turing machines.
|
[
{
"version": "v1",
"created": "Fri, 3 Dec 1999 00:13:07 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Dec 1999 15:16:46 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Sicard",
"Andrés",
""
],
[
"Vélez",
"Mario",
""
]
] |
quant-ph/9912013
|
Huo Wujun
|
LIU Yufeng, HUO Wujun and ZENG Jinyan (Department of Physics, Peking
University, Beijing, P. R. China ")
|
Angular momentum and energy structure of the coherent state of a 2D
isotropic harmonic oscillator
|
no figure. to appear in Comm. in Theor. Phys
|
Commum. Theor. Phys. 33, 487 (2000)
| null | null |
quant-ph
| null |
The angular momentum structure and energy structure of the coherent state of
a 2D isotropic harmonic oscillator were investigated. Calculations showed that
the average values of angular momentum and energy (except the zero point
energy) of this nonspreading 2D wave packet are identical to those of the
corresponding classical oscillator moving along a circular or an elliptic
orbit.
|
[
{
"version": "v1",
"created": "Fri, 3 Dec 1999 02:48:33 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Yufeng",
"LIU",
"",
"Department of Physics, Peking\n University, Beijing, P. R. China \""
],
[
"Wujun",
"HUO",
"",
"Department of Physics, Peking\n University, Beijing, P. R. China \""
],
[
"Jinyan",
"ZENG",
"",
"Department of Physics, Peking\n University, Beijing, P. R. China \""
]
] |
quant-ph/9912014
|
Alexander Kozhekin
|
A. E. Kozhekin, K. Molmer and E. Polzik (University of Aarhus)
|
Quantum Memory for Light
|
submittted to PRL
| null |
10.1103/PhysRevA.62.033809
| null |
quant-ph
| null |
We propose an efficient method for mapping and storage of a quantum state of
propagating light in atoms. The quantum state of the light pulse is stored in
two sublevels of the ground state of a macroscopic atomic ensemble by
activating a synchronized Raman coupling between the light and atoms. We
discuss applications of the proposal in quantum information processing and in
atomic clocks operating beyond quantum limits of accuracy. The possibility of
transferring the atomic state back on light via teleportation is also
discussed.
|
[
{
"version": "v1",
"created": "Fri, 3 Dec 1999 09:47:37 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Kozhekin",
"A. E.",
"",
"University of Aarhus"
],
[
"Molmer",
"K.",
"",
"University of Aarhus"
],
[
"Polzik",
"E.",
"",
"University of Aarhus"
]
] |
quant-ph/9912015
|
Michele Pavon
|
Michele Pavon
|
Derivation of the wave function collapse in the context of Nelson's
stochastic mechanics
|
24 pages
|
J. Math. Physics 40 (1999), 5565-5577
|
10.1063/1.533046
| null |
quant-ph
| null |
The von Neumann collapse of the quantum mechanical wavefunction after a
position measurement is derived by a purely probabilistic mechanism in the
context of Nelson's stochastic mechanics.
|
[
{
"version": "v1",
"created": "Fri, 3 Dec 1999 10:00:19 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Pavon",
"Michele",
""
]
] |
quant-ph/9912016
|
Oleg Dorofeyev
|
B.A. Lysov, O.A. Lysova, O.F. Dorofeyev
|
Quantum-defect Electron States Near a Helium Surface
|
4 pages, LaTex
| null | null | null |
quant-ph
| null |
Isolated electrons resting near a helium surface have a spectrum close to
that of a quantum-defect atom. A precisely solvable model with Rydberg spectrum
is sugguested and discussed.
|
[
{
"version": "v1",
"created": "Fri, 3 Dec 1999 13:44:02 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Lysov",
"B. A.",
""
],
[
"Lysova",
"O. A.",
""
],
[
"Dorofeyev",
"O. F.",
""
]
] |
quant-ph/9912017
|
L. M. Duan
|
Lu-Ming Duan, G. Giedke, J. I. Cirac, and P. Zoller
|
Entanglement purification of Gaussian continuous variable quantum states
|
4 pages,1 figure, final version
|
Phys. Rev. Lett. 84, 4002 (2000)
|
10.1103/PhysRevLett.84.4002
| null |
quant-ph
| null |
We describe an entanglement purification protocol to generate maximally
entangled states with high efficiencies from two-mode squeezed states or from
mixed Gaussian continuous entangled states. The protocol relies on a local
quantum non-demolition measurement of the total excitation number of several
continuous variable entangled pairs. We propose an optical scheme to do this
kind of measurement using cavity enhanced cross--Kerr interactions.
|
[
{
"version": "v1",
"created": "Fri, 3 Dec 1999 14:52:02 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Sep 2000 09:08:19 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Duan",
"Lu-Ming",
""
],
[
"Giedke",
"G.",
""
],
[
"Cirac",
"J. I.",
""
],
[
"Zoller",
"P.",
""
]
] |
quant-ph/9912018
|
John Hamilton
|
John Hamilton
|
An obstruction based approach to the Kochen-Specker theorem
|
14 pages, 6 figures
|
J. Phys A: Math. Gen 33 (2000) p3783-3794
|
10.1088/0305-4470/33/20/305
|
Imperial/TP/99-0/11
|
quant-ph
| null |
In [1] it was shown that the Kochen Specker theorem can be written in terms
of the non-existence of global elements of a certain varying set over the
partially ordered set of boolean subalgebras of projection operators on some
Hilbert space. In this paper, we show how obstructions to the construction of
such global elements arise, and how this provides a new way of looking at
proofs of the theorem.
|
[
{
"version": "v1",
"created": "Fri, 3 Dec 1999 14:59:52 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Hamilton",
"John",
""
]
] |
quant-ph/9912019
|
George Chapline
|
George Chapline
|
Quantum Mechanics as Information Fusion
|
postscript, 9 pages
| null | null | null |
quant-ph
| null |
We provide evidence that quantum mechanics can be interpreted as a rational
algorithm for finding the least complex description for the correlations in the
outputs of sensors in a large array. In particular, by comparing the
self-organization approach to solving the Traveling Salesman Problem with a
solution based on taking the classical limit of a Feynman path integral, we are
led to a connection between the quantum mechanics of motion in a magnetic field
and self-organized information fusion.
|
[
{
"version": "v1",
"created": "Sat, 4 Dec 1999 00:29:10 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Chapline",
"George",
""
]
] |
quant-ph/9912020
|
Castagnoli Giuseppe
|
Giuseppe Castagnoli (Elsag Bailey, Genova, Italy)
|
A Quantum Logic Gate Representation of Quantum Measurement: Reversing
and Unifying the Two Steps of von Neumann's Model
|
17 pages, RevTex, 1 PostScript file with figure, submitted to Int. J.
Theor. Phys
| null | null | null |
quant-ph
| null |
In former work, quantum computation has been shown to be a problem solving
process essentially affected by both the reversible dynamics leading to the
state before measurement, and the logical-mathematical constraints introduced
by quantum measurement (in particular, the constraint that there is only one
measurement outcome). This dual influence, originated by independent initial
and final conditions, justifies the quantum computation speed-up and is not
representable inside dynamics, namely as a one-way propagation. In this work,
we reformulate von Neumann's model of quantum measurement at the light of above
findings. We embed it in a broader representation based on the quantum logic
gate formalism and capable of describing the interplay between dynamical and
non-dynamical constraints. The two steps of the original model, namely (1)
dynamically reaching a complete entanglement between pointer and quantum object
and (2) enforcing the one-outcome-constraint, are unified and reversed. By
representing step (2) right from the start, the same dynamics of step (1)
yields a probability distribution of mutually exclusive measurement outcomes.
This appears to be a more accurate and complete representation of quantum
measurement. PACS: 03.67.-a, 03.67.Lx, 03.65.Bz
|
[
{
"version": "v1",
"created": "Mon, 6 Dec 1999 16:22:10 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Castagnoli",
"Giuseppe",
"",
"Elsag Bailey, Genova, Italy"
]
] |
quant-ph/9912021
|
Toshihiko Ono
|
Toshihiko Ono
|
Overview of "Structure behind Mechanics"
|
8 pages
| null | null | null |
quant-ph
| null |
This letter proposes a new scenario to solve the structural or conceptual
problems remained in quantum mechanics, and gives an overview of the theory
proposed in quant-ph/9906130 (including quant-ph/9909025 and quant-ph/0001015).
|
[
{
"version": "v1",
"created": "Sun, 5 Dec 1999 18:10:29 GMT"
},
{
"version": "v2",
"created": "Sun, 19 Dec 1999 19:26:29 GMT"
},
{
"version": "v3",
"created": "Tue, 4 Jan 2000 15:12:00 GMT"
},
{
"version": "v4",
"created": "Mon, 31 Jan 2000 16:20:36 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Ono",
"Toshihiko",
""
]
] |
quant-ph/9912022
|
Michael Fleischhauer
|
M. Fleischhauer, S. F. Yelin, M. D. Lukin
|
How to Trap Photons? Storing Single-Photon Quantum States in Collective
Atomic Excitations
|
14 pages, 6 figures, to appear in Optics Communications
| null |
10.1016/S0030-4018(99)00679-3
| null |
quant-ph
| null |
We show that it is possible to ``store'' quantum states of single-photon
fields by mapping them onto {\it collective} meta-stable states of an optically
dense, coherently driven medium inside an optical resonator. An adiabatic
technique is suggested which allows to transfer non-classical correlations from
traveling-wave single-photon wave-packets into atomic states and vise versa
with nearly 100% efficiency. In contrast to previous approaches involving
single atoms, the present technique does not require the strong coupling regime
corresponding to high-Q micro-cavities. Instead, intracavity
Electromagnetically Induced Transparency is used to achieve a strong coupling
between the cavity mode and the atoms.
|
[
{
"version": "v1",
"created": "Mon, 6 Dec 1999 08:54:28 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Fleischhauer",
"M.",
""
],
[
"Yelin",
"S. F.",
""
],
[
"Lukin",
"M. D.",
""
]
] |
quant-ph/9912023
|
Andrea Aiello
|
Andrea Aiello
|
Input-Output Relations in Optical Cavities: a Simple Point of View
|
34 pages, 5 figures jpg, LaTex
| null |
10.1103/PhysRevA.62.063813
| null |
quant-ph
| null |
In this work we present a very simple approach to input-output relations in
optical cavities, limiting ourselves to one- and two-photon states of the
field.
After field quantization, we derive the non-unitary transformation between
{\em Inside} and {\em Outside} annihilation and creation operators. Then we
express the most general two-photon state generated by {\em Inside} creation
operators, through base states generated by {\em Outside} creation operators.
After renormalization of coefficients of inside two-photon state, we calculate
the outside photon-number probability distribution in a general case. Finally
we treat with some detail the single mode and symmetrical cavity case.
|
[
{
"version": "v1",
"created": "Mon, 6 Dec 1999 10:40:08 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Aiello",
"Andrea",
""
]
] |
quant-ph/9912024
|
Michael Thorwart
|
M. Thorwart (1), M. Grifoni (2,3) and P. H\"anggi (1), ((1) University
of Augsburg, Germany, (2) University of Karlsruhe (Germany), (3) University
of Genova, Italy)
|
Strong coupling theory for driven tunneling and vibrational relaxation
|
4 LaTeX pages including 3 figures
|
Phys. Rev. Lett. 85, 860 (2000)
|
10.1103/PhysRevLett.85.860
| null |
quant-ph
| null |
We investigate on a unified basis tunneling and vibrational relaxation in
driven dissipative multistable systems described by their N lowest lying
unperturbed levels. By use of the discrete variable representation we derive a
set of coupled non-Markovian master equations. We present analytical treatments
that describe the dynamics in the regime of strong system-bath coupling. Our
findings are corroborated by ``ab-initio'' real-time path integral
calculations.
|
[
{
"version": "v1",
"created": "Mon, 6 Dec 1999 14:35:17 GMT"
},
{
"version": "v2",
"created": "Sun, 6 Feb 2000 16:23:42 GMT"
},
{
"version": "v3",
"created": "Wed, 9 Aug 2000 11:02:23 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Thorwart",
"M.",
""
],
[
"Grifoni",
"M.",
""
],
[
"Hänggi",
"P.",
""
]
] |
quant-ph/9912025
|
DaeKil Park
|
ChangSoo Park and D. K. Park
|
Effect of Aharonov-Bohm Phase on Spin Tunneling
|
12 pages, no figure
|
Mod. Phys. Lett. B, 14 (2000) 919
|
10.1142/S0217984900001130
| null |
quant-ph cond-mat hep-th
| null |
The role of Aharonov-Bohm effect in quantum tunneling is examined when a
potential is defined on the $S^1$ and has $N$-fold symmetry. We show that the
low-lying energy levels split from the $N$-fold degenerate ground state
oscillate as a function of the Aharonov-Bohm phase, from which general
degeneracy conditions depending on the magnetic flux is obtained. We apply
these results to the spin tunneling in a spin system with $N$-fold rotational
symmetry around a hard axis.
|
[
{
"version": "v1",
"created": "Tue, 7 Dec 1999 07:17:35 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Aug 2000 20:16:40 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Park",
"ChangSoo",
""
],
[
"Park",
"D. K.",
""
]
] |
quant-ph/9912026
|
P. V. Elyutin
|
P.V. Elyutin and A.N. Rogovenko
|
On stimulated transitions between the self-trapped states of the
nonlinear Schrodinger equation
|
16 pages REVTEX, 5 Postscript figures
| null | null | null |
quant-ph
| null |
The studied model describes a particle that obeys a one-dimensional nonlinear
Schr\"odinger equation in the potential of a double-well. Transitions between
the two lowest self-trapped states of this system under the influence of the
external time-dependent perturbation are studied in the two-mode approximation.
If the perturbation dependence on time is harmonic with the frequency $\omega$,
then transitions between the states become possible if the amplitude of the
perturbation $F$ exceeds some threshold value $F_c(\omega)$; above the
threshold motion of the system becomes chaotic. If the perturbation is a
broadband noise, then transitions between the states are possible at
arbitrarily small $F$ and occur in the process of the system's energy
diffusion.
|
[
{
"version": "v1",
"created": "Tue, 7 Dec 1999 11:09:06 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Elyutin",
"P. V.",
""
],
[
"Rogovenko",
"A. N.",
""
]
] |
quant-ph/9912027
|
Miloslav Znojil
|
Miloslav Znojil
|
PT-symetrically regularized Eckart,Poeschl-Teller and Hulthen potentials
|
Original 10-page letter ``PT-symmetrized exact solution of the
singular Eckart oscillator" is extended to a full paper
|
J. Phys. A: Math. Gen. 33 (2000) 4561 - 4572
|
10.1088/0305-4470/33/24/311
| null |
quant-ph
| null |
Version 1: The well known Eckart's singular s-wave potential is
PT-symmetrically regularized and continued to the whole real line. The new
model remains exactly solvable and its bound states remain proportional to
Jacobi polynomials. Its real and discrete spectrum exhibits several unusual
features.
Version 2: Parity times time-reversal symmetry of complex Hamiltonians with
real spectra is usually interpreted as a weaker mathematical substitute for
Hermiticity. Perhaps an equally important role is played by the related
strengthened analyticity assumptions. In a constructive illustration we
complexify a few potentials solvable only in s-wave. Then we continue their
domain from semi-axis to the whole axis and get the new exactly solvable
models. Their energies come out real as expected. The new one-dimensional
spectra themselves differ quite significantly from their s-wave predecessors.
|
[
{
"version": "v1",
"created": "Tue, 7 Dec 1999 15:59:10 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Mar 2000 16:52:37 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Znojil",
"Miloslav",
""
]
] |
quant-ph/9912028
|
Pierre Meystre
|
G. A. Prataviera, J. Zapata and P. Meystre
|
Higher-order mutual coherence of optical and matter waves
|
11 pages, 2 figures
| null |
10.1103/PhysRevA.62.023605
| null |
quant-ph cond-mat physics.atom-ph
| null |
We use an operational approach to discuss ways to measure the higher-order
cross-correlations between optical and matter-wave fields. We pay particular
attention to the fact that atomic fields actually consist of composite
particles that can easily be separated into their basic constituents by a
detection process such as photoionization. In the case of bosonic fields, that
we specifically consider here, this leads to the appearance in the detection
signal of exchange contributions due to both the composite bosonic field and
its individual fermionic constituents. We also show how time-gated counting
schemes allow to isolate specific contributions to the signal, in particular
involving different orderings of the Schr\"odinger and Maxwell fields.
|
[
{
"version": "v1",
"created": "Tue, 7 Dec 1999 16:09:41 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Prataviera",
"G. A.",
""
],
[
"Zapata",
"J.",
""
],
[
"Meystre",
"P.",
""
]
] |
quant-ph/9912029
|
Marek Zukowski
|
Marek Zukowski
|
Bell Theorem for Nonclassical Part of Quantum Teleportation Process
|
4 pages, RevTeX, no figures
| null |
10.1103/PhysRevA.62.032101
| null |
quant-ph
| null |
The quantum teleportation process is composed of a joint measurement
performed upon two subsystems A and B (uncorrelated), followed by a unitary
transformation (parameters of which depend on the outcome of the measurement)
performed upon a third subsystem C (EPR correlated with system B). The
information about the outcome of the measurement is transferred by classical
means. The measurement performed upon the systems A and B collapses their joint
wavefunction into one of the four {\it entangled} Bell states. It is shown here
that this measurement process plus a possible measurement on the third
subsystem (with classical channel switched off - no additional unitary
transformation performed) cannot be described by a local realistic theory.
|
[
{
"version": "v1",
"created": "Tue, 7 Dec 1999 16:27:21 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Zukowski",
"Marek",
""
]
] |
quant-ph/9912030
|
Antonio Cesar Aguiar Pinto
|
A.C. Aguiar Pinto, M.C. Nemes, J.G. Peixoto de Faria and M.T. Thomaz
|
Comment on the Adiabatic Condition
|
9 pages
|
Am. J. of Phys. {\bf 68} (2000) 955-958
|
10.1119/1.1285944
| null |
quant-ph
| null |
The experimental observation of effects due to Berry's phase in quantum
systems is certainly one of the most impressive demonstrations of the
correctness of the superposition principle in quantum mechanics. Since Berry's
original paper in 1984, the spin 1/2 coupled with rotating external magnetic
field has been one of the most studied models where those phases appear. We
also consider a special case of this soluble model. A detailed analysis of the
coupled differential equations and comparison with exact results teach us why
the usual procedure (of neglecting nondiagonal terms) is mathematically sound.
|
[
{
"version": "v1",
"created": "Tue, 7 Dec 1999 16:28:51 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Mar 2000 17:19:48 GMT"
},
{
"version": "v3",
"created": "Wed, 8 Nov 2000 18:23:31 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Pinto",
"A. C. Aguiar",
""
],
[
"Nemes",
"M. C.",
""
],
[
"de Faria",
"J. G. Peixoto",
""
],
[
"Thomaz",
"M. T.",
""
]
] |
quant-ph/9912031
|
Angelo Bassi
|
Angelo Bassi and GianCarlo Ghirardi
|
Decoherent Histories and Realism
|
34 pages, LaTeX. To appear in Journ. Stat. Phys
|
J.Statist.Phys. 98 (2000) 457-494
| null | null |
quant-ph
| null |
We reconsider the Decoherent Histories approach to Quantum Mechanics and we
analyze some problems related to its interpretation which, according to us,
have not been adequately clarified by its proponents. We put forward some
assumptions which, in our opinion, are necessary for a realistic interpretation
of the probabilities that the formalism attaches to decoherent histories. We
prove that such assumptions, unless one limits the set of the decoherent
families which can be taken into account, lead to a logical contradiction. The
line of reasoning we will follow is conceptually different from other arguments
which have been presented and which have been rejected by the supporters of the
Decoherent Histories approach. The conclusion is that the Decoherent Histories
approach, to be considered as an interesting realistic alternative to the
orthodox interpretation of Quantum Mechanics, requires the identification of a
mathematically precise criterion to characterize an appropriate set of
decoherent families which does not give rise to any problem.
|
[
{
"version": "v1",
"created": "Tue, 7 Dec 1999 17:13:37 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Bassi",
"Angelo",
""
],
[
"Ghirardi",
"GianCarlo",
""
]
] |
quant-ph/9912032
|
Richard L. Hall
|
Richard L. Hall
|
Functional inversion for potentials in quantum mechanics
|
14 pages, 2 figures
|
Phys. Lett. A265, 28-34 (2000)
|
10.1016/S0375-9601(99)00872-5
|
CUQM-74
|
quant-ph math-ph math.MP
| null |
Let E = F(v) be the ground-state eigenvalue of the Schroedinger Hamiltonian H
= -Delta + vf(x), where the potential shape f(x) is symmetric and monotone
increasing for x > 0, and the coupling parameter v is positive.
If the 'kinetic potential' bar{f}(s) associated with f(x) is defined by the
transformation: bar{f}(s) = F'(v), s = F(v)-vF'(v),then f can be reconstructed
from F by the sequence: f^{[n+1]} = bar{f} o bar{f}^{[n]^{-1}} o f^{[n]}.
Convergence is proved for special classes of potential shape; for other test
cases it is demonstrated numerically. The seed potential shape f^{[0]} need not
be 'close' to the limit f.
|
[
{
"version": "v1",
"created": "Tue, 7 Dec 1999 17:34:59 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Hall",
"Richard L.",
""
]
] |
quant-ph/9912033
|
Sougato Bose
|
S. Bose and V. Vedral
|
Mixedness and teleportation
|
6 pages, no figures
| null |
10.1103/PhysRevA.61.040101
| null |
quant-ph
| null |
We show that on exceeding a certain degree of mixedness (as quantified by the
von Neumann entropy), entangled states become useless for teleporatation. By
increasing the dimension of the entangled systems, this entropy threshold can
be made arbitrarily close to maximal. This entropy is found to exceed the
entropy threshold sufficient to ensure the failure of dense coding.
|
[
{
"version": "v1",
"created": "Tue, 7 Dec 1999 20:26:10 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Bose",
"S.",
""
],
[
"Vedral",
"V.",
""
]
] |
quant-ph/9912034
|
Nuno Dias
|
Nuno Costa Dias
|
Classicality Criteria
|
23 pages. Revised version, to appear in the J. Math. Phys
|
J. Math. Phys. 43 (2002) 5882-5901
| null | null |
quant-ph
| null |
We present two possible criteria quantifying the degree of classicality of an
arbitrary (finite dimensional) dynamical system. The inputs for these criteria
are the classical dynamical structure of the system together with the quantum
and the classical data providing the two alternative descriptions of its
initial time configuration. It is proved that a general quantum system
satisfying the criteria up to some extend displays a time evolution consistent
with the classical predictions up to some degree and thus it is argued that the
criteria provide a suitable measure of classicality. The features of the
formalism are illustrated through two simple examples.
|
[
{
"version": "v1",
"created": "Tue, 7 Dec 1999 22:16:43 GMT"
},
{
"version": "v2",
"created": "Sat, 14 Sep 2002 18:13:22 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Dias",
"Nuno Costa",
""
]
] |
quant-ph/9912035
|
Wolfgang Tittel
|
W. Tittel, H. Zbinden, and N. Gisin
|
Quantum secret sharing using pseudo-GHZ states
|
4 pages including 3 figures and 1 table
| null | null | null |
quant-ph
| null |
We present a setup for quantum secret sharing using pseudo-GHZ states based
on energy-time entanglement. In opposition to true GHZ states, our states do
not enable GHZ-type tests of nonlocality, however, they bare the same quantum
correlations. The relatively high coincidence count rates found in our setup
enable for the first time an application of a quantum communication protocoll
based on more than two qubits.
|
[
{
"version": "v1",
"created": "Wed, 8 Dec 1999 08:11:49 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Tittel",
"W.",
""
],
[
"Zbinden",
"H.",
""
],
[
"Gisin",
"N.",
""
]
] |
quant-ph/9912036
|
Masurao Kamada
|
Nan-Jian Wu, M. Kamada, A. Natori and H. Yasunaga
|
Quantum Computer Using Coupled Quantum Dot Molecules
|
18 pages, 7 figures, submitted to Jpn. J. Appl. Phys, please send
your e-mail to Nan-Jian Wu <[email protected]>
| null |
10.1143/JJAP.39.4642
| null |
quant-ph
| null |
We propose a method for implementation of a quantum computer using artificial
molecules. The artificial molecule consists of two coupled quantum dots stacked
along z direction and one single electron. One-qubit and two-qubit gates are
constructed by one molecule and two coupled molecules, respectively.The ground
state and the first excited state of the molecule are used to encode the |0>
and |1> states of a qubit. The qubit is manipulated by a resonant
electromagnetic wave that is applied directly to the qubit through a microstrip
line. The coupling between two qubits in a quantum controlled NOT gate is
switched on (off) by floating (grounding) the metal film electrodes. We study
the operations of the gates by using a box-shaped quantum dot model and
numerically solving a time-dependent Schridinger equation, and demonstrate that
the quantum gates can perform the quantum computation. The operating speed of
the gates is about one operation per 4ps. The reading operation of the output
of the quantum computer can be performed by detecting the polarization of the
qubits.
|
[
{
"version": "v1",
"created": "Wed, 8 Dec 1999 11:02:33 GMT"
},
{
"version": "v2",
"created": "Thu, 9 Dec 1999 12:19:37 GMT"
},
{
"version": "v3",
"created": "Fri, 10 Dec 1999 06:48:04 GMT"
},
{
"version": "v4",
"created": "Wed, 27 Sep 2000 16:05:28 GMT"
},
{
"version": "v5",
"created": "Sat, 7 Oct 2000 13:38:10 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Wu",
"Nan-Jian",
""
],
[
"Kamada",
"M.",
""
],
[
"Natori",
"A.",
""
],
[
"Yasunaga",
"H.",
""
]
] |
quant-ph/9912037
|
Jonathan Halliwell
|
J. J. Halliwell
|
The Emergence of Hydrodynamic Equations from Quantum Theory: A
Decoherent Histories Analysis
|
16 pages, plain Tex. To appear in Proceedings of the 4th Peyresq
Conference, 1999
| null | null |
Imperial/TP/99-0/14
|
quant-ph
| null |
The most general description of the classical world is in terms of local
densities (such as number, momentum, energy), and these typically evolve
according to evolution equations of hydrodynamic form. To explain the emergent
classicality of these variables from an underlying quantum theory, it is
therefore necessary to show, firstly, that these variables exhibit negligible
interference, and secondly, that the probabilities for histories of them are
peaked around hydrodynamic evolution. The implementation of this programme in
the context of the decoherent histories approach to quantum theory is
described. It is argued that, for a system of weakly interacting particles, the
eigenstates of local densities (averaged over a sufficiently large volume)
remain approximate eigenstates under time evolution. This is a consequence of
their close connection with the corresponding exactly conserved (and so exactly
decoherent) quantities. The subsequent derivation of hydrodynamic equations
from decoherent histories is discussed.
|
[
{
"version": "v1",
"created": "Wed, 8 Dec 1999 15:46:23 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Halliwell",
"J. J.",
""
]
] |
quant-ph/9912038
|
Shao-Ming Fei
|
Sergio Albeverio, Shao-Ming Fei
|
A Remark on the Optimal Cloning of An N-Level Quantum System
|
8 pages, Latex
|
Eur.Phys.J. B14 (2000) 669-672
|
10.1007/s100510051077
| null |
quant-ph cond-mat hep-th
| null |
We study quantum cloning machines (QCM) that act on an unknown N-level
quantum state and make M copies. We give a formula for the maximum of the
fidelity of cloning and exhibit the unitary transformations that realize this
optimal fidelity. We also extend the results to treat the case of M copies from
$N^\prime$ ($M>N^\prime$) identical N-level quantum systems.
|
[
{
"version": "v1",
"created": "Wed, 8 Dec 1999 17:38:02 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Albeverio",
"Sergio",
""
],
[
"Fei",
"Shao-Ming",
""
]
] |
quant-ph/9912039
|
Benjamin Schumacher
|
N. Linden (1), S. Popescu (1), B. Schumacher (2), M. Westmoreland (3)
((1) University of Bristol, (2) Kenyon College, (3) Denison University)
|
Reversibility of local transformations of multiparticle entanglement
|
5 pages, RevTeX (no figures)
| null | null | null |
quant-ph
| null |
We consider the transformation of multisystem entangled states by local
quantum operations and classical communication. We show that, for any
reversible transformation, the relative entropy of entanglement for two parties
must remain constant. This shows, for example, that it is not possible to
convert 2N three party GHZ states into 3N singlets, even in an asymptotic
sense. Thus there is true three-party non-locality (i.e., not all three-party
entanglement is equivalent to two-party entanglement). Our results also allow
us to make {\em quantitative} statements about concentrating multi-particle
entanglement. Finally, we show that there is true n-party entanglement for all
n.
|
[
{
"version": "v1",
"created": "Wed, 8 Dec 1999 21:40:29 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Linden",
"N.",
"",
"University of Bristol"
],
[
"Popescu",
"S.",
"",
"University of Bristol"
],
[
"Schumacher",
"B.",
"",
"Kenyon College"
],
[
"Westmoreland",
"M.",
"",
"Denison University"
]
] |
quant-ph/9912040
|
Seth Lloyd
|
Seth Lloyd (MIT), Benjamin Rahn (Harvard), Charlene Ahn (Caltech)
|
Robust quantum computation by simulation
|
8 pages, TeX
| null | null | null |
quant-ph
| null |
Simulation of quantum systems that provide intrinsically fault-tolerant
quantum computation is shown to preserve fault tolerance. Errors committed in
the course of simulation are eliminated by the natural error-correcting
features of the systems simulated. Two examples are explored, toric codes and
non-abelian anyons. The latter is shown to provide universal robust quantum
computation via simulation.
|
[
{
"version": "v1",
"created": "Wed, 8 Dec 1999 22:38:52 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Lloyd",
"Seth",
"",
"MIT"
],
[
"Rahn",
"Benjamin",
"",
"Harvard"
],
[
"Ahn",
"Charlene",
"",
"Caltech"
]
] |
quant-ph/9912041
|
Benni Reznik
|
Yakir Aharonov and Benni Reznik
|
Local/Non-Local Complementarity in Topological Effects
|
4 pages
|
Phys. Rev. Lett. 84, 4790 (2000).
|
10.1103/PhysRevLett.84.4790
| null |
quant-ph
| null |
In certain topological effects the accumulation of a quantum phase shift is
accompanied by a local observable effect. We show that such effects manifest a
complementarity between non-local and local attributes of the topology, which
is reminiscent but yet different from the usual wave-particle complementarity.
This complementarity is not a consequence of non-commutativity, rather it is
due to the non-canonical nature of the observables. We suggest that a
local/non-local complementarity is a general feature of topological effects
that are ``dual'' to the AB effect.
|
[
{
"version": "v1",
"created": "Thu, 9 Dec 1999 09:21:33 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Aharonov",
"Yakir",
""
],
[
"Reznik",
"Benni",
""
]
] |
quant-ph/9912042
| null |
G. K\"albermann (Soil and Water department, Faculty of Agriculture,
Israel)
|
Wave packet scattering from an attractive well
|
Final version, Journal of Physics A, to be published
|
J.Phys.A34:3841-3858,2001
|
10.1088/0305-4470/34/18/312
| null |
quant-ph nucl-th
| null |
Wave packet scattering off an attractive well is investigated in two spatial
dimensions numerically. The results confirm what was found previously for the
one dimensional case. The wave scattered at large angles is a polychotomous
(multiple peak) coherent train. Large angle scattering is extremely important
for low impinging velocities and at all impact parameters. The effect
disappears for packets more extended than the well. Experiments to detect the
polychotomous behavior are suggested.
|
[
{
"version": "v1",
"created": "Thu, 9 Dec 1999 10:52:45 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Mar 2001 08:05:15 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Kälbermann",
"G.",
"",
"Soil and Water department, Faculty of Agriculture,\n Israel"
]
] |
quant-ph/9912043
| null |
M.Genovese, C. Novero
|
Quantum non-demolition (QND) modulation of quantum interference
|
accepted for publication
|
Phys. Rev. A 61 032102 (2000)
|
10.1103/PhysRevA.61.032102
|
IEN 1999
|
quant-ph physics.optics
| null |
We propose an experiment where quantum interference between two different
paths is modulated by means of a QND measurement on one or both the arm of the
interferometer. The QND measurement is achieved in a Kerr cell. We illustrate a
scheme for the realisation of this experiment and some further developments.
|
[
{
"version": "v1",
"created": "Thu, 9 Dec 1999 09:44:39 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Genovese",
"M.",
""
],
[
"Novero",
"C.",
""
]
] |
quant-ph/9912044
|
Richard A. Mould
|
Richard A Mould
|
A defense of Hellwig-Kraus reductions
|
10 pages. 3 figures
| null | null | null |
quant-ph
| null |
Aharonov and Albert analyze a thought experiment which they believe shows
that quantum mechanical state reductions occur along temporal hypersurfaces in
Minkowski space. They conclude that the covariant state reduction theory of
Hellwig and Kraus does not apply. In Part I of this paper we disagree with this
interpretation of the A-A experiment, and show the adequacy of the H-K theory.
In Part II we examine the belief that H-K reductions produce self contradicting
causal loops, and/or give rise to absurd boundary conditions. These objections
to the theory are shown to be unfounded.
|
[
{
"version": "v1",
"created": "Thu, 9 Dec 1999 14:01:31 GMT"
}
] | 2009-09-25T00:00:00 |
[
[
"Mould",
"Richard A",
""
]
] |
quant-ph/9912045
|
M. Dima
|
M. Dima
|
Quantum Particle-Trajectories and Geometric Phase
|
4 pages
|
published in JETP Lett. 72(11) p. 785 (Dec. 10 2000)
|
10.1134/1.1348476
|
WUD 99-47
|
quant-ph
| null |
"Particle"-trajectories are defined as integrable $dx_\mu dp^\mu = 0$ paths
in projective space.
Quantum states evolving on such trajectories, open or closed, do not
delocalise in $(x, p)$ projection, the phase associated with the trajectories
being related to the geometric (Berry) phase and the Classical Mechanics
action. High Energy Physics properties of states evolving on
"particle"-trajectories are discussed.
|
[
{
"version": "v1",
"created": "Thu, 9 Dec 1999 15:23:43 GMT"
},
{
"version": "v10",
"created": "Fri, 18 May 2001 17:54:22 GMT"
},
{
"version": "v11",
"created": "Mon, 10 Nov 2003 20:41:14 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Jan 2000 13:58:44 GMT"
},
{
"version": "v3",
"created": "Tue, 31 Oct 2000 23:56:43 GMT"
},
{
"version": "v4",
"created": "Wed, 1 Nov 2000 19:59:42 GMT"
},
{
"version": "v5",
"created": "Thu, 2 Nov 2000 22:04:02 GMT"
},
{
"version": "v6",
"created": "Fri, 10 Nov 2000 19:52:54 GMT"
},
{
"version": "v7",
"created": "Sat, 11 Nov 2000 01:33:50 GMT"
},
{
"version": "v8",
"created": "Wed, 29 Nov 2000 20:28:56 GMT"
},
{
"version": "v9",
"created": "Mon, 9 Apr 2001 16:17:56 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Dima",
"M.",
""
]
] |
quant-ph/9912046
|
Mikhail Lukin
|
M.D.Lukin, S.F.Yelin and M.Fleischhauer
|
Entanglement of Atomic Ensembles by Trapping Correlated Photon States
| null | null |
10.1103/PhysRevLett.84.4232
| null |
quant-ph
| null |
We describe a general technique that allows for an ideal transfer of quantum
correlations between light fields and metastable states of matter. The
technique is based on trapping quantum states of photons in coherently driven
atomic media, in which the group velocity is adiabatically reduced to zero. We
discuss possible applications such as quantum state memories, generation of
squeezed atomic states, preparation of entangled atomic ensembles and quantum
information processing.
|
[
{
"version": "v1",
"created": "Fri, 10 Dec 1999 01:00:20 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Lukin",
"M. D.",
""
],
[
"Yelin",
"S. F.",
""
],
[
"Fleischhauer",
"M.",
""
]
] |
quant-ph/9912047
| null |
Alexander R. Kessel and Vladimir L. Ermakov
|
Multiqubit Spin
|
7 pages, PostScript, no figures; translation of Pis'ma Zh. Eksp.
Teor. Fiz. 70, No. 1, pp. 59-63, 10 July 1999; (Submitted 29 April 1999;
resubmitted 2 June 1999)
|
JETP Letters 70 (1999) 61-65
|
10.1134/1.568130
| null |
quant-ph
| null |
It is proposed that the state space of a quantum object with a complicated
discrete spectrum can be used as a basis for multiqubit recording and
processing of information in a quantum computer. As an example, nuclear spin
3/2 is considered. The possibilities of writing and reading two quantum bits of
information, preparation of the initial state, implementation of the "rotation"
and "controlled negation" operations, which are sufficient for constructing any
algorithms, are demonstrated.
|
[
{
"version": "v1",
"created": "Fri, 10 Dec 1999 12:34:35 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Kessel",
"Alexander R.",
""
],
[
"Ermakov",
"Vladimir L.",
""
]
] |
quant-ph/9912048
|
Martin Bojowald
|
Martin Bojowald and Thomas Strobl
|
Symplectic Cuts and Projection Quantization
|
12 pages, v2: additional examples and a new reference to related work
|
Int.J.Mod.Phys. D12 (2003) 713-725
|
10.1142/S0218271803002810
|
PITHA 99/35, FSUJ-TPI-12/99, ESI 802
|
quant-ph gr-qc hep-th math.SG
| null |
The recently proposed projection quantization, which is a method to quantize
particular subspaces of systems with known quantum theory, is shown to yield a
genuine quantization in several cases. This may be inferred from exact results
established within symplectic cutting.
|
[
{
"version": "v1",
"created": "Fri, 10 Dec 1999 14:12:51 GMT"
},
{
"version": "v2",
"created": "Wed, 7 Jun 2000 08:47:28 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Bojowald",
"Martin",
""
],
[
"Strobl",
"Thomas",
""
]
] |
quant-ph/9912049
|
Taksu Cheon de Caracorum
|
Taksu Cheon (Kochi Tech) and T. Shigehara (Saitama U)
|
Continuous Spectra of Generalized Kronig-Penney Model
|
LaTeX 6 Pages (include 7 eps figures, use a personal sty file) For
related articles, see also http://www.mech.kochi-tech.ac.jp/cheon/
|
Journal of the Physical Society of Japan 73 (2004) 2986-2990
|
10.1143/JPSJ.73.2986
| null |
quant-ph cond-mat
| null |
The standard Kronig-Penney model with periodic $\delta$ potentials is
extended to the cases with generalized contact interactions. The eigen equation
which determines the dispersion relation for one-dimensional periodic array of
the generalized contact interactions is deduced with the transfer matrix
formalism. Numerical results are presented which reveal unexpected band spectra
with broader band gap in higher energy region for generic model with
generalized contact interaction.
|
[
{
"version": "v1",
"created": "Fri, 10 Dec 1999 17:40:55 GMT"
},
{
"version": "v2",
"created": "Sat, 11 Dec 1999 01:46:34 GMT"
},
{
"version": "v3",
"created": "Wed, 26 Apr 2006 07:02:01 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Cheon",
"Taksu",
"",
"Kochi Tech"
],
[
"Shigehara",
"T.",
"",
"Saitama U"
]
] |
quant-ph/9912050
|
Ennio Gozzi
|
A.A.Abrikosov (jr.), E.Gozzi
|
Quantization and Time
|
4 pages,Latex,uses espcrc2.sty. Talk by E.G at the QG99, Villasimius
(Sardinia, Italy) 13-17 September 99
|
Nucl.Phys.Proc.Suppl. 66 (2000) 369
|
10.1016/S0920-5632(00)00804-5
| null |
quant-ph gr-qc
| null |
Starting from a functional formulation of classical mechanics, we show how to
perform its quantization by freezing to zero two Grassmannian partners of time.
|
[
{
"version": "v1",
"created": "Fri, 10 Dec 1999 20:37:29 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Abrikosov",
"A. A.",
"",
"jr."
],
[
"Gozzi",
"E.",
""
]
] |
quant-ph/9912051
|
Helmut Kroger
|
C.Q. Huang, H. Kr\"oger, X.Q. Luo and K.J.M. Moriarty
|
Monte Carlo Hamiltonian from Stochastic Basis
|
revised version, new figures. Text (LaTeX), 4 Figs. (eps), style file
|
Phys.Lett. A299 (2002) 483-493
|
10.1016/S0375-9601(02)00750-8
| null |
quant-ph hep-lat
| null |
In order to extend the recently proposed Monte Carlo Hamiltonian to many-body
systems, we suggest to concept of a stochastic basis. We apply it to the chain
of $N_s=9$ coupled anharmonic oscillators. We compute the spectrum of excited
states in a finite energy window and thermodynamical observables free energy,
average energy, entropy and specific heat in a finite temperature window.
Comparing the results of the Monte Carlo Hamiltonian with standard Lagrangian
lattice calculations, we find good agreement. However, the Monte Carlo
Hamiltonian results show less fluctuations under variation of temperature.
|
[
{
"version": "v1",
"created": "Fri, 10 Dec 1999 22:10:30 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Jan 2002 14:26:33 GMT"
}
] | 2016-08-15T00:00:00 |
[
[
"Huang",
"C. Q.",
""
],
[
"Kröger",
"H.",
""
],
[
"Luo",
"X. Q.",
""
],
[
"Moriarty",
"K. J. M.",
""
]
] |
quant-ph/9912052
|
Jonathan P. Dowling
|
Agedi N. Boto, Pieter Kok, Daniel S. Abrams, Samuel L. Braunstein,
Colin P. Williams, and Jonathan P. Dowling
|
Quantum Interferometric Optical Lithography: Exploiting Entanglement to
Beat The Diffraction Limit
|
9 pages, 2 figures
|
Phys. Rev. Lett. 85, 2733 (2000)
|
10.1103/PhysRevLett.85.2733
| null |
quant-ph
| null |
Classical, interferometric, optical lithography is diffraction limited to
writing features of a size lambda/2 or greater, where lambda is the optical
wavelength. Using nonclassical photon number states, entangled N at a time, we
show that it is possible to write features of minimum size lambda/(2N) in an
N-photon absorbing substrate. This result surpasses the usual classical
diffraction limit by a factor of N. Since the number of features that can be
etched on a two-dimensional surface scales inversely as the square of the
feature size, this allows one to write a factor of N^2 more elements on a
semiconductor chip. A factor of N = 2 can be achieved easily with entangled
photon pairs generated from optical parametric downconversion. It is shown how
to write arbitrary 2D patterns by using this method.
|
[
{
"version": "v1",
"created": "Sat, 11 Dec 1999 02:03:29 GMT"
},
{
"version": "v2",
"created": "Thu, 4 May 2000 00:06:50 GMT"
}
] | 2010-04-09T00:00:00 |
[
[
"Boto",
"Agedi N.",
""
],
[
"Kok",
"Pieter",
""
],
[
"Abrams",
"Daniel S.",
""
],
[
"Braunstein",
"Samuel L.",
""
],
[
"Williams",
"Colin P.",
""
],
[
"Dowling",
"Jonathan P.",
""
]
] |
quant-ph/9912053
|
P. Oscar Boykin
|
Eli Biham, Michel Boyer, P. Oscar Boykin, Tal Mor, Vwani Roychowdhury
|
A Proof of the Security of Quantum Key Distribution
| null | null | null | null |
quant-ph
| null |
We prove the security of quantum key distribution against the most general
attacks which can be performed on the channel, by an eavesdropper who has
unlimited computation abilities, and the full power allowed by the rules of
classical and quantum physics. A key created that way can then be used to
transmit secure messages in a way that their security is also unaffected in the
future.
|
[
{
"version": "v1",
"created": "Sat, 11 Dec 1999 04:58:11 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Biham",
"Eli",
""
],
[
"Boyer",
"Michel",
""
],
[
"Boykin",
"P. Oscar",
""
],
[
"Mor",
"Tal",
""
],
[
"Roychowdhury",
"Vwani",
""
]
] |
quant-ph/9912054
|
Brian C. Hall
|
Brian C. Hall
|
Holomorphic Methods in Mathematical Physics
|
Final version
|
Contemporary Mathematics, Volume 260, pp. 1-59
| null | null |
quant-ph math-ph math.MP
| null |
This set of lecture notes gives an introduction to holomorphic function
spaces as used in mathematical physics. The emphasis is on the Segal-Bargmann
space and the canonical commutation relations. Later sections describe more
advanced topics such as the Segal-Bargmann transform for compact Lie groups and
the infinite-dimensional theory.
|
[
{
"version": "v1",
"created": "Sat, 11 Dec 1999 20:51:37 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Sep 2000 23:07:02 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Hall",
"Brian C.",
""
]
] |
quant-ph/9912055
|
Michael J. W. Hall
|
Michael J. W. Hall
|
Quantum properties of classical Fisher information
|
16 pages
|
Physical Review A 62 (2000) 012107 (6pp.)
|
10.1103/PhysRevA.62.012107
| null |
quant-ph
| null |
The Fisher information of a quantum observable is shown to be proportional to
both (i) the difference of a quantum and a classical variance, thus providing a
measure of nonclassicality; and (ii) the rate of entropy increase under
Gaussian diffusion, thus providing a measure of robustness. The joint
nonclassicality of position and momentum observables is shown to be
complementary to their joint robustness in an exact sense.
|
[
{
"version": "v1",
"created": "Mon, 13 Dec 1999 23:30:22 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Hall",
"Michael J. W.",
""
]
] |
quant-ph/9912056
|
Hagen Kleinert
|
H.Kleinert, A. Chervyakov
|
Reparametrization Invariance of Perturbatively Defined Path Integrals.
II. Integrating Products of Distributions
|
Author Information under
http://www.physik.fu-berlin.de/~kleinert/institution.html . Latest update of
paper also at http://www.physik.fu-berlin.de/~kleinert/302
|
Phys.Lett. B47 (2000) 373
|
10.1016/S0370-2693(00)00199-4
| null |
quant-ph hep-th
| null |
We show how to perform integrals over products of distributions in coordinate
space such as to reproduce the results of momentum space Feynman integrals in
dimensional regularization. This ensures the invariance of path integrals under
coordinate transformations. The integrals are uniquely defined by expressing
the propagators in 1- epsilon dimensions in terms of modified Bessel functions.
|
[
{
"version": "v1",
"created": "Sun, 12 Dec 1999 11:08:35 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Feb 2000 08:18:57 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Kleinert",
"H.",
""
],
[
"Chervyakov",
"A.",
""
]
] |
quant-ph/9912057
|
Mike York
|
Michael J. York
|
Permutation Symmetry For Many Particles
| null | null | null | null |
quant-ph
| null |
We consider the implications of the Revised Symmetrization Postulate (see
quant-ph/9908078) for states of more than two particles. We show how to create
permutation symmetric state vectors and how to derive alternative state vectors
that may be asymmetric for any pair by creating asymmetric interdependencies in
their state descriptions. Because we can choose any pair to create such an
asymmetry, the usual generalized exclusion rules which result, apply
simultaneously to any pair. However, we distinguish between simultaneous
pairwise exclusion rules and the simultaneous pairwise anti-symmetry of the
conventional symmetrization postulate. We show how to construct a variety of
state vectors with multiple interdependencies in their state descriptions and
various exchange asymmetries - including one which is anti-symmetric under
exchange of two bosons - all without violating the spin-statistics theorem. We
conjecture that it is possible to construct state vectors for arbitrary mixes
of bosons and fermions that emulate the conventional symmetrization postulate
in a limited way and give examples. We also prove that it is not possible to
define a single state vector that simultaneously obeys the conventional
symmetrization postulate in its standard form (in which the exchange phase does
not depend on the spins of additional particles that are present) for every
pair that can be interchanged.
|
[
{
"version": "v1",
"created": "Mon, 13 Dec 1999 04:56:42 GMT"
}
] | 2011-09-06T00:00:00 |
[
[
"York",
"Michael J.",
""
]
] |
quant-ph/9912058
|
Bassano Vacchini
|
L.Lanz, O.Melsheimer and B.Vacchini
|
Subdynamics as a mechanism for objective description
|
latex, 15 pages. Paper submitted to Proc. Conference "Mysteries,
Puzzles And Paradoxes In Quantum Mechanics, Workshop on Entanglement And
Decoherence, Palazzo Feltrinelli, Gargnano, Garda Lake, Italy, 20-25
September, 1999
|
J. Mod. Opt. 47 (2000) 2165-2180
|
10.1080/09500340008235139
| null |
quant-ph
| null |
The relationship between microsystems and macrosystems is considered in the
context of quantum field formulation of statistical mechanics: it is argued
that problems on foundations of quantum mechanics can be solved relying on this
relationship. This discussion requires some improvement of non-equilibrium
statistical mechanics that is briefly presented.
|
[
{
"version": "v1",
"created": "Mon, 13 Dec 1999 10:19:44 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Lanz",
"L.",
""
],
[
"Melsheimer",
"O.",
""
],
[
"Vacchini",
"B.",
""
]
] |
quant-ph/9912059
|
Garnik F. Mkrtchian
|
T. R. Hovhannisyan, A. G. Markossian and G. F. Mkrtchian (Yerevan
State University)
|
On the theory of the relativistic cross sections for stimulated
bremsstrahlung on an arbitrary electrostatic potential in the strong
electromagnetic field
|
Revtex,10 pages,3 figures
| null | null | null |
quant-ph
| null |
On the base of relativistic generalized eikonal approximation wave function
the multiphoton cross sections of a Dirac particle bremsstrahlung on an
arbitrary electrostatic potential and strong laser radiation field are
presented. In the limit of the Born approximation the ultimate analytical
formulas for arbitrary polarization of electromagnetic wave have been obtained.
|
[
{
"version": "v1",
"created": "Mon, 13 Dec 1999 11:54:31 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Hovhannisyan",
"T. R.",
"",
"Yerevan\n State University"
],
[
"Markossian",
"A. G.",
"",
"Yerevan\n State University"
],
[
"Mkrtchian",
"G. F.",
"",
"Yerevan\n State University"
]
] |
quant-ph/9912060
|
Andreas Ruschhaupt
|
Andreas Ruschhaupt
|
Relativistic Time of Arrival
|
latex, 13 pages, 6 postscript figures
| null | null | null |
quant-ph
| null |
We propose a covariant algorithm for relativistic ideal measurements and for
relativistic continuous measurements, its non-relativistic limit results the
algorithm of the Event-Enhanced Quantum Theory. Therefore an additional
intrinsic parameter, the proper time, is used. As an application we compute the
time of arrival of a particle at a detector and find good agreement between the
expected values of the time of arrival for weak detectors and the results of
the relativistic point-mechanic over a wide range. For very high momentums
there is a small probability for a negative time of arrival, so the expected
times are a bit smaller than the results of the relativistic mechanics.
|
[
{
"version": "v1",
"created": "Mon, 13 Dec 1999 12:29:34 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Ruschhaupt",
"Andreas",
""
]
] |
quant-ph/9912061
|
Valery N. Gorbachev
|
V.N. Gorbachev and A.I. Trubilko
|
Teleportation of entanglement for continuous variables
|
7 pages, latex, minor changes, some typos corrected
| null | null | null |
quant-ph
| null |
Teleportation of a pure two particle entangled state of continuous variables
by triplet of the Greenberger-Horne-Zeilinger form is considered.
The three-particle basis needed for a joint measurement is found. It
describes a measurement of momentum one of single particle and total moment and
relative position of the two others. Optical realization using squeezed state
of the light is discussed.
|
[
{
"version": "v1",
"created": "Mon, 13 Dec 1999 12:30:29 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Jul 2000 19:58:18 GMT"
}
] | 2022-01-26T00:00:00 |
[
[
"Gorbachev",
"V. N.",
""
],
[
"Trubilko",
"A. I.",
""
]
] |
quant-ph/9912062
|
Evgeny Korsunsky
|
E.A. Korsunsky and D.V. Kosachiov
|
Generation of continuous-wave THz radiation by use of quantum
interference
|
18 pages, 4 figures
| null |
10.1364/JOSAB.17.001405
| null |
quant-ph
| null |
We propose a scheme for generation of continuous-wave THz radiation. The
scheme requires a medium where three discrete states in a $\Lambda $
configuration can be selected, with the THz-frequency transition between the
two lower metastable states. We consider the propagation of three-frequency
continuous-wave electromagnetic (e.m.) radiation through a $\Lambda $ medium.
Under resonant excitation, the medium absorption can be strongly reduced due to
quantum interference of transitions, while the nonlinear susceptibility is
enhanced. This leads to very efficient energy transfer between the e.m. waves
providing a possibility for THz generation. We demonstrate that the photon
conversion efficiency is approaching unity in this technique.
|
[
{
"version": "v1",
"created": "Mon, 13 Dec 1999 14:59:42 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Korsunsky",
"E. A.",
""
],
[
"Kosachiov",
"D. V.",
""
]
] |
quant-ph/9912063
|
Evgeny Korsunsky
|
D.V. Kosachiov and E.A. Korsunsky
|
Efficient microwave-induced optical frequency conversion
|
15 pages, 5 figures
| null |
10.1007/s100530070073
| null |
quant-ph
| null |
Frequency conversion process is studied in a medium of atoms with a $\Lambda$
configuration of levels, where transition between two lower states is driven by
a microwave field. In this system, conversion efficiency can be very high by
virtue of the effect of electromagnetically induced transparency (EIT).
Depending on intensity of the microwave field, two regimes of EIT are realized:
''dark-state'' EIT for the weak field, and Autler-Townes-type EIT for the
strong one. We study both cases via analytical and numerical solution and find
optimum conditions for the conversion.
|
[
{
"version": "v1",
"created": "Mon, 13 Dec 1999 15:10:21 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Kosachiov",
"D. V.",
""
],
[
"Korsunsky",
"E. A.",
""
]
] |
quant-ph/9912064
|
Jan-Ake Larsson
|
Sven Aerts, Paul Kwiat, Jan-{\AA}ke Larsson, and Marek Zukowski
|
Two-photon Franson-type experiments and local realism
|
revtex, 4 pages, 4 figures
|
Phys. Rev. Lett. 83: 2872-2875 (1999)
|
10.1103/PhysRevLett.83.2872
| null |
quant-ph
| null |
The two-photon interferometric experiment proposed by Franson [Phys. Rev.
Lett. 62, 2205 (1989)] is often treated as a "Bell test of local realism".
However, it has been suggested that this is incorrect due to the 50%
postselection performed even in the ideal gedanken version of the experiment.
Here we present a simple local hidden variable model of the experiment that
successfully explains the results obtained in usual realizations of the
experiment, even with perfect detectors. Furthermore, we also show that there
is no such model if the switching of the local phase settings is done at a rate
determined by the internal geometry of the interferometers.
|
[
{
"version": "v1",
"created": "Mon, 13 Dec 1999 15:41:48 GMT"
}
] | 2022-03-16T00:00:00 |
[
[
"Aerts",
"Sven",
""
],
[
"Kwiat",
"Paul",
""
],
[
"Larsson",
"Jan-Åke",
""
],
[
"Zukowski",
"Marek",
""
]
] |
quant-ph/9912065
|
Ghirardi Giancarlo,
|
Angelo Bassi and GianCarlo Ghirardi
|
About the Notion of Truth in the Decoherent Histories Approach: a reply
to Griffiths
|
4 pages, Latex, to appear in Phys. Lett. A
|
Phys.Lett. A265 (2000) 153
|
10.1016/S0375-9601(99)00889-0
| null |
quant-ph
| null |
Griffiths claims that the ``single family rule'', a basic postulate of the
decoherent histories approach, rules out our requirement that any decoherent
history has a unique truth value, independently from the decoherent family to
which it may belong. Here we analyze the reasons which make our requirement
indispensable and we discuss the consequences of rejecting it.
|
[
{
"version": "v1",
"created": "Mon, 13 Dec 1999 16:48:55 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Bassi",
"Angelo",
""
],
[
"Ghirardi",
"GianCarlo",
""
]
] |
quant-ph/9912066
|
Jose Rosas
|
J. Oscar Rosas-Ortiz
|
Supersymmetric derivation of the hard core deuteron's bound state
|
9 pages, LaTex, 2 Postscript figures
|
Group Theoretical Methods in Physics; GS Pogosyan, LE Vicent and
KB Wolf (Eds), IOPCS 185, Bristol UK (2004) 485-490
| null | null |
quant-ph
| null |
A supersymmetric construction of potentials describing the hard core
interaction of the neutron-proton system for low energies is proposed. It
considers only the binding energy case and uses the approximation of the Yukawa
potential given by Hulthen. Recent experimental data for the binding energy of
the deuteron are used to give the involved orders of magnitude.
|
[
{
"version": "v1",
"created": "Tue, 14 Dec 1999 03:10:03 GMT"
}
] | 2008-10-13T00:00:00 |
[
[
"Rosas-Ortiz",
"J. Oscar",
""
]
] |
quant-ph/9912067
|
R. F. Werner
|
A.S. Holevo and R.F. Werner
|
Evaluating capacities of Bosonic Gaussian channels
|
14 pages, RevTeX, 5 eps figures
| null | null | null |
quant-ph
| null |
We show how to compute or at least to estimate various capacity-related
quantities for Bosonic Gaussian channels. Among these are the coherent
information, the entanglement assisted classical capacity, the one-shot
classical capacity, and a new quantity involving the transpose operation, shown
to be a general upper bound on the quantum capacity, even allowing for finite
errors. All bounds are explicitly evaluated for the case of a one-mode channel
with attenuation/amplification and classical noise.
|
[
{
"version": "v1",
"created": "Tue, 14 Dec 1999 09:02:04 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Holevo",
"A. S.",
""
],
[
"Werner",
"R. F.",
""
]
] |
quant-ph/9912068
|
Dmitri S. Kilin
|
M. Schreiber, D. Kilin, U. Kleinekathoefer
|
Comparison of two models for bridge-assisted charge transfer
|
12 pages including 4 figures, 1 table, 26 references. For more info
see http://eee.tu-chemnitz.de/~kilin
|
J. Lumin. 83-84 (1999) 235
|
10.1016/S0022-2313(99)00104-0
| null |
quant-ph
| null |
Based on the reduced density matrix method, we compare two different
approaches to calculate the dynamics of the electron transfer in systems with
donor, bridge, and acceptor. In the first approach a vibrational substructure
is taken into account for each electronic state and the corresponding states
are displaced along a common reaction coordinate. In the second approach it is
assumed that vibrational relaxation is much faster than the electron transfer
and therefore the states are modeled by electronic levels only. In both
approaches the system is coupled to a bath of harmonic oscillators but the way
of relaxation is quite different. The theory is applied to the electron
transfer in ${\rm H_2P}-{\rm ZnP}-{\rm Q}$ with free-base porphyrin (${\rm
H_2P}$) being the donor, zinc porphyrin (${\rm ZnP}$) being the bridge and
quinone (${\rm Q}$) the acceptor. The parameters are chosen as similar as
possible for both approaches and the quality of the agreement is discussed.
|
[
{
"version": "v1",
"created": "Tue, 14 Dec 1999 11:35:05 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Schreiber",
"M.",
""
],
[
"Kilin",
"D.",
""
],
[
"Kleinekathoefer",
"U.",
""
]
] |
quant-ph/9912069
|
Mikhail Sergeenko
|
M.N. Sergeenko
|
Quasiclassical Analysis of the Three-dimensional Shredinger's Equation
and its Solution
|
18 pages,LaTeX, added references, corrected typos
|
Mod. Phys. Lett. A, 15(2) (2000) 83
|
10.1142/S0217732300000104
|
UICHEP-TH/99-8
|
quant-ph
| null |
The three-dimensional Schredinger's equation is analyzed with the help of the
correspondence principle between classical and quantum-mechanical quantities.
Separation is performed after reduction of the original equation to the form of
the classical Hamilton-Jacobi equation. Each one-dimensional equation obtained
after separation is solved by the conventional WKB method. Quasiclassical
solution of the angular equation results in the integral of motion $\vec
M^2=(l+\frac 12)^2\hbar^2$ and the existence of nontrivial solution for the
angular quantum number $l=0$. Generalization of the WKB method for
multi-turning-point problems is given. Exact eigenvalues for solvable and some
"insoluble" spherically symmetric potentials are obtained. Quasiclassical
eigenfunctions are written in terms of elementary functions in the form of a
standing wave.
|
[
{
"version": "v1",
"created": "Tue, 14 Dec 1999 17:55:41 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Jan 2000 22:56:11 GMT"
}
] | 2015-11-25T00:00:00 |
[
[
"Sergeenko",
"M. N.",
""
]
] |
quant-ph/9912070
|
Giuseppe Vitiello
|
Eliano Pessa and Giuseppe Vitiello
|
Quantum dissipation and neural net dynamics
|
latex file Published: Bioelectrochemistry and Bioenergetics,
48:339-342, 1999
|
Bioelectrochem.Bioenerg 48 (1999) 339-342
| null | null |
quant-ph cond-mat.other hep-th physics.bio-ph q-bio.OT
| null |
Inspired by the dissipative quantum model of brain, we model the states of
neural nets in terms of collective modes by the help of the formalism of
Quantum Field Theory. We exhibit an explicit neural net model which allows to
memorize a sequence of several informations without reciprocal destructive
interference, namely we solve the overprinting problem in such a way last
registered information does not destroy the ones previously registered.
Moreover, the net is able to recall not only the last registered information in
the sequence, but also anyone of those previously registered.
|
[
{
"version": "v1",
"created": "Tue, 14 Dec 1999 18:25:07 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Pessa",
"Eliano",
""
],
[
"Vitiello",
"Giuseppe",
""
]
] |
quant-ph/9912071
|
Nuno Dias
|
Nuno Costa Dias
|
Half Quantization
|
20 pages, LaTex file, Substantially revised version
|
J. Phys. A:Math. Gen. 34 (2001) 771-791
|
10.1088/0305-4470/34/4/306
| null |
quant-ph
| null |
A general dynamical system composed by two coupled sectors is considered. The
initial time configuration of one of these sectors is described by a set of
classical data while the other is described by standard quantum data. These
dynamical systems will be named half quantum. The aim of this paper is to
derive the dynamical evolution of a general half quantum system from its full
quantum formulation. The standard approach would be to use quantum mechanics to
make predictions for the time evolution of the half quantum initial data. The
main problem is how can quantum mechanics be applied to a dynamical system
whose initial time configuration is not described by a set of fully quantum
data. A solution to this problem is presented and used, as a guideline to
obtain a general formulation of coupled classical-quantum dynamics. Finally, a
quantization prescription mapping a given classical theory to the correspondent
half quantum one is presented.
|
[
{
"version": "v1",
"created": "Wed, 15 Dec 1999 02:45:03 GMT"
},
{
"version": "v2",
"created": "Wed, 24 May 2000 17:46:21 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Dias",
"Nuno Costa",
""
]
] |
quant-ph/9912072
|
Holger F. Hofmann
|
Holger F. Hofmann, Takayoshi Kobayashi, and Akira Furusawa
|
Nonclassical correlations of photon number and field components in the
vacuum state
|
13 pages, 3 figures, corrections of omissions in equations (6) and
(25). To be published in Phys. Rev. A
|
Phys. Rev. A 62, 013806 (2000)
|
10.1103/PhysRevA.62.013806
| null |
quant-ph physics.optics
| null |
It is shown that the quantum jumps in the photon number n from zero to one or
more photons induced by backaction evasion quantum nondemolition measurements
of a quadrature component x of the vacuum light field state are strongly
correlated with the quadrature component measurement results. This correlation
corresponds to the operator expectation value <xnx> which is equal to one
fourth for the vacuum even though the photon number eigenvalue is zero. Quantum
nondemolition measurements of a quadrature component can thus provide
experimental evidence of the nonclassical operator ordering dependence of the
correlations between photon number and field components in the vacuum state.
|
[
{
"version": "v1",
"created": "Wed, 15 Dec 1999 03:32:52 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Feb 2000 04:41:15 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Apr 2000 02:51:19 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Hofmann",
"Holger F.",
""
],
[
"Kobayashi",
"Takayoshi",
""
],
[
"Furusawa",
"Akira",
""
]
] |
quant-ph/9912073
|
Toshiki Shimbori
|
Toshiki Shimbori
|
Operator Methods of the Parabolic Potential Barrier
|
7 pages, AmS-LaTeX, no figures
| null |
10.1016/S0375-9601(00)00462-X
|
UTHEP-415
|
quant-ph
| null |
The one-dimensional parabolic potential barrier dealt with in an earlier
paper is re-examined from the point of view of operator methods, for the
purpose of getting generalized Fock spaces.
|
[
{
"version": "v1",
"created": "Wed, 15 Dec 1999 10:56:10 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Shimbori",
"Toshiki",
""
]
] |
quant-ph/9912074
|
Mr. Arindam Mitra Physics Group
|
Arindam Mitra
|
Noised based cipher system
|
Revised, Latex, 4 pages
| null | null | null |
quant-ph
| null |
A computationally secure noised based cipher system is proposed. The
advantage of this cipher system is that it operates above noise level.
Therefore computationally secure communication can be done when error
correction code fails. Another feature of this system is that minimum number of
exhaustive key search can be made fixed.
|
[
{
"version": "v1",
"created": "Wed, 15 Dec 1999 13:28:51 GMT"
},
{
"version": "v2",
"created": "Fri, 17 Dec 1999 11:17:46 GMT"
},
{
"version": "v3",
"created": "Tue, 12 Sep 2000 12:51:50 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Mitra",
"Arindam",
""
]
] |
quant-ph/9912075
|
Dennis Dieks
|
Dennis Dieks
|
Consistent histories and relativistic invariance in the modal
interpretation of quantum mechanics
|
13 pages, no figures
| null |
10.1016/S0375-9601(00)00006-2
| null |
quant-ph
| null |
Modal interpretations of quantum mechanics assign definite properties to
physical systems and specify single-time joint probabilities of these
properties. We show that a natural extension, applying to properties at several
times, can be given if a decoherence condition is satisfied. This extension
defines "consistent histories" of modal properties. We suggest a new form of
the modal scheme, that offers prospects of a more general applicability of the
histories concept. Finally, we discuss a possible way of applying these ideas
to relativistic quantum field theory.
|
[
{
"version": "v1",
"created": "Wed, 15 Dec 1999 14:47:18 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Dieks",
"Dennis",
""
]
] |
quant-ph/9912076
|
Michal Horodecki
|
Michal Horodecki, Pawel Horodecki and Ryszard Horodecki
|
Erratum: Asymptotic entanglement manipulations can be genuinely
irreversible. [Phys. Rev. Lett. {\bf 84}, 4260 (2000)]
|
1 page, added date of Werner's earlier proof of bound for distillable
entanglement (Benasque, 1998)
| null | null | null |
quant-ph
| null |
This is erratum of the paper [Phys. Rev. Lett. {\bf 84}, 4260 (2000)]
|
[
{
"version": "v1",
"created": "Wed, 15 Dec 1999 20:44:15 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Dec 1999 16:43:20 GMT"
},
{
"version": "v3",
"created": "Mon, 5 Mar 2001 18:07:19 GMT"
},
{
"version": "v4",
"created": "Thu, 11 Oct 2001 16:34:10 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Horodecki",
"Michal",
""
],
[
"Horodecki",
"Pawel",
""
],
[
"Horodecki",
"Ryszard",
""
]
] |
quant-ph/9912077
|
A. G. Kofman
|
A. G. Kofman and G. Kurizki
|
The Zeno and anti-Zeno effects on decay in dissipative quantum systems
|
8 pages, 5 figures
|
acta physica slovaca 49 (1999) 541-548 (the title there is ``Decay
control in dissipative quantum systems'')
| null | null |
quant-ph
| null |
We point out that the quantum Zeno effect, i.e., inhibition of spontaneous
decay by frequent measurements, is observable only in spectrally finite
reservoirs, i.e., in cavities and waveguides, using a sequence of
evolution-interrupting pulses or randomly-modulated CW fields. By contrast,
such measurements can only accelerate decay in free space.
|
[
{
"version": "v1",
"created": "Thu, 16 Dec 1999 09:03:01 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Kofman",
"A. G.",
""
],
[
"Kurizki",
"G.",
""
]
] |
quant-ph/9912078
|
Theor. Phys. Group
|
Qiong-gui Lin
|
Levinson theorem for Dirac particles in one dimension
|
REVTeX, 17 pages, no figure
|
Eur. Phys. J. D 7 (1999) 515-524
|
10.1007/s100530050379
| null |
quant-ph
| null |
The scattering of Dirac particles by symmetric potentials in one dimension is
studied. A Levinson theorem is established. By this theorem, the number of
bound states with even (odd) parity, $n_+$ ($n_-$), is related to the phase
shifts $\eta_+(\pm E_k)$ [$\eta_-(\pm E_k)$] of scattering states with the same
parity at zero momentum as follows: $$\eta_\pm(\mu)+\eta_\pm(-\mu)\pm{\pi\over
2}[\sin^2\eta_\pm(\mu) -\sin^2\eta_\pm(-\mu)]=n_\pm\pi.$$ The theorem is
verified by several simple examples.
|
[
{
"version": "v1",
"created": "Thu, 16 Dec 1999 11:00:01 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Lin",
"Qiong-gui",
""
]
] |
quant-ph/9912079
|
Miloslav Znojil
|
Miloslav Znojil
|
New set of exactly solvable complex potentials giving the real energies
|
submitted to Phys. Rev. A
| null | null | null |
quant-ph
| null |
We deform the real potential of Poeschl and Teller by a shift of its
coordinate in imaginary direction. We show that the new model remains exactly
solvable. Its bound states are constructed in closed form. Wave functions are
complex and proportional to Jacobi polynomials. Some of them diverge in the
Hermitian limit. In contrast, all their energies prove real and
shift-independent. In this sense the lost Hermiticity of our family of
Hamiltonians seems replaced by their accidental PT symmetry.
|
[
{
"version": "v1",
"created": "Thu, 16 Dec 1999 11:01:52 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Znojil",
"Miloslav",
""
]
] |
quant-ph/9912080
|
Jens Eisert
|
J. Eisert, M. Wilkens
|
Catalysis of entanglement manipulation for mixed states
|
5 pages (RevTex). Final version, to appear in Phys. Rev. Lett
|
Phys.Rev.Lett. 85 (2000) 437
|
10.1103/PhysRevLett.85.437
| null |
quant-ph
| null |
We consider entanglement-assisted remote quantum state manipulation of
bi-partite mixed states. Several aspects are addressed: we present a class of
mixed states of rank two that can be transformed into another class of mixed
states under entanglement-assisted local operations with classical
communication, but for which such a transformation is impossible without
assistance. Furthermore, we demonstrate enhancement of the efficiency of
purification protocols with the help of entanglement-assisted operations.
Finally, transformations from one mixed state to mixed target states which are
sufficiently close to the source state are contrasted to similar
transformations in the pure-state case.
|
[
{
"version": "v1",
"created": "Thu, 16 Dec 1999 16:24:13 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Jan 2000 16:30:03 GMT"
},
{
"version": "v3",
"created": "Mon, 22 May 2000 13:45:19 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Eisert",
"J.",
""
],
[
"Wilkens",
"M.",
""
]
] |
quant-ph/9912081
|
N. David Mermin
|
N. David Mermin
|
A Kochen-Specker Theorem for Imprecisely Specified Measurement
|
3 pages
| null | null | null |
quant-ph
| null |
A recent claim that finite precision in the design of real experiments
``nullifies'' the impact of the Kochen-Specker theorem, is shown to be
unsupportable, because of the continuity of probabilities of measurement
outcomes under slight changes in the experimental configuration.
|
[
{
"version": "v1",
"created": "Thu, 16 Dec 1999 17:05:37 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Mermin",
"N. David",
""
]
] |
quant-ph/9912082
|
Caroline H. Thompson
|
Caroline H Thompson
|
Rotational Invariance, Phase Relationships and the Quantum Entanglement
Illusion
|
10 pages, including 2 figs. See also related work at
http://www.aber.ac.uk/~cat
| null | null | null |
quant-ph
| null |
Another Bell test "loophole" - imperfect rotational invariance - is explored,
and novel realist ideas on parametric down-conversion as used in recent
"quantum entanglement" experiments are presented. The usual quantum theory of
entangled systems assumes we have rotational invariance (RI), so that
coincidence rates depend on the difference only between detector settings, not
on the absolute values. Bell tests, as such, do not necessarily require RI, but
where it fails the presentation of results in the form of coincidence curves
can be grossly misleading. Even if the well-known detection loophole were
closed, the visibility of such curves would tell us nothing about the degree of
entanglement! The problem may be especially relevant to recent experiments
using "degenerate type II parametric down-conversion" sources. Logical analysis
of the results of many experiments suggests realist explanations involving some
new physics. The systems may be more nearly deterministic than quantum theory
implies. Whilst this may be to the advantage of those attempting to make use of
the so-called "Bell correlations" in computing, encryption, "teleportation"
etc., it does mean that the systems obey ordinary, not quantum, logic.
|
[
{
"version": "v1",
"created": "Thu, 16 Dec 1999 19:30:08 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Thompson",
"Caroline H",
""
]
] |
quant-ph/9912083
|
Masanori Ohya
|
Karl-Heinz Fichtner and Masanori Ohya
|
Quantum Teleportation with Entangled States given by Beam Splittings
|
25 pages, Latex 2e
|
Commun.Math.Phys. 222, 229-247 (2001)
|
10.1007/s002200100497
| null |
quant-ph
| null |
Quantum teleportation is rigorously discussed with coherent entang led states
given by beam splittings. The mathematical scheme of beam splitti ng has been
used to study quantum communication and quantum stochastic. We d iscuss the
teleportation process by means of coherent states in this scheme for the
following two cases: (1) Delete the vacuum part from coherent states, whose
compensation provides us a perfect teleportation from Alice to Bob. (2) Use
fully realistic (physical) coherent states, which give s a non-perfect
teleportation but shows that it is exact when the average en ergy (density) of
the coherent vectors goes to infinity.
|
[
{
"version": "v1",
"created": "Fri, 17 Dec 1999 08:44:44 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Fichtner",
"Karl-Heinz",
""
],
[
"Ohya",
"Masanori",
""
]
] |
quant-ph/9912084
|
D. Trifonov
|
D.A. Trifonov
|
The Uncertainty Way of Generalization of Coherent States
|
Latex, 17 pages (16x23cm text), no figures. Two misprints corrected
(in eqs. (5) and (36)). Appeared in the Proc. Int. Conference on Geometry,
Integrability and Quantization (1-10 Sep, 1999, Varna)
|
In "Geometry, Integrability and Quantization", Eds. I.M. Mladenov
and G.L. Naber (Coral Press, Sofia 2000), p. 257- 282
| null | null |
quant-ph math-ph math.MP
| null |
The three ways of generalization of canonical coherent states are briefly
reviewed and compared with the emphasis laid on the (minimum) uncertainty way.
The characteristic uncertainty relations, which include the Schroedinger and
Robertson inequalities, are extended to the case of several states. It is shown
that the standard SU(1,1) and SU(2) coherent states are the unique states which
minimize the second order characteristic inequality for the three generators. A
set of states which minimize the Schroedinger inequality for the Hermitian
components of the su_q(1,1) ladder operator is also constructed. It is noted
that the characteristic uncertainty relations can be written in the alternative
complementary form.
|
[
{
"version": "v1",
"created": "Fri, 17 Dec 1999 15:47:21 GMT"
},
{
"version": "v2",
"created": "Sat, 18 Dec 1999 08:00:32 GMT"
},
{
"version": "v3",
"created": "Wed, 29 Dec 1999 11:41:36 GMT"
},
{
"version": "v4",
"created": "Sat, 1 Apr 2000 15:00:37 GMT"
},
{
"version": "v5",
"created": "Fri, 13 Oct 2000 09:55:00 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Trifonov",
"D. A.",
""
]
] |
quant-ph/9912085
|
Astrid Lambrecht
|
A. Lambrecht and S. Reynaud
|
Comment on "Demonstration of the Casimir Force in the 0.6 to 6
micrometer Range"
|
1 page, LaTeX, 2 encapsulated postscript figures
|
Phys. Rev. Lett. 84, 5672 (2000)
|
10.1103/PhysRevLett.84.5672
| null |
quant-ph
| null |
We comment on a recently published measurement of the Casimir force for
distances in the 0.6 to 6 micrometer range between two Au surfaces (Phys. Rev.
Lett. 78, 5(1997)) and the net discrepancy reported for the comparison with
theoretical predictions (Phys. Rev. Lett. 81, 5475 (1998)).
|
[
{
"version": "v1",
"created": "Fri, 17 Dec 1999 11:40:11 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Lambrecht",
"A.",
""
],
[
"Reynaud",
"S.",
""
]
] |
quant-ph/9912086
|
Seth Lloyd
|
Seth Lloyd (MIT Mechanical Engineering)
|
Programming Pulse Driven Quantum Computers
|
15 pages, TeX. This 1993 preprint, together with its shorter version
(A potentially realizable quantum computer, Science 261, 1569, 1993) shows
how a scalable universal quantum computer could be constructed using optical
or magnetic resonance
| null | null | null |
quant-ph
| null |
Arrays of weakly-coupled quantum systems can be made to compute by subjecting
them to a sequence of electromagnetic pulses of well-defined frequency and
length. Such pulsed arrays are true quantum computers: bits can be placed in
superpositions of 0 and 1, logical operations take place coherently, and
dissipation is required only for error correction. Programming such computers
is accomplished by selecting the proper sequence of pulses.
|
[
{
"version": "v1",
"created": "Fri, 17 Dec 1999 22:29:17 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Lloyd",
"Seth",
"",
"MIT Mechanical Engineering"
]
] |
quant-ph/9912087
|
Masanori Ohya
|
Luigi Accardi and Masanori Ohya
|
Teleportation of general quantum states
|
16 pages, Latex 2e
| null | null | null |
quant-ph
| null |
Quantum teleportation has been introduced by Benett et al. and dis cussed by
a number of authors in the framework of the singlet state. Recentl y, a
rigorous formulation of the teleportation problem of arbitrary quantum states
by means of quantum channel was given in [IOS] based on the general c hannel
theoretical formulation of the quantum gates introduced in [OW]. In t his note
we discuss a generalization of the scheme proposed in [IOS] and we give a
general method to solve the teleportation problem in spaces of arbitr ary
finite dimensions.
|
[
{
"version": "v1",
"created": "Fri, 17 Dec 1999 17:57:19 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Accardi",
"Luigi",
""
],
[
"Ohya",
"Masanori",
""
]
] |
quant-ph/9912088
|
Seth Lloyd
|
Seth Lloyd (MIT)
|
Universe as quantum computer
|
7 pages, TeX
|
Complexity 3(1), 32-35 (1997)
| null | null |
quant-ph
| null |
This paper shows that universal quantum computers possess decoherent
histories in which complex adaptive systems evolve with high probability.
|
[
{
"version": "v1",
"created": "Fri, 17 Dec 1999 22:36:18 GMT"
}
] | 2007-05-23T00:00:00 |
[
[
"Lloyd",
"Seth",
"",
"MIT"
]
] |
quant-ph/9912089
|
BG Englert
|
Berthold-Georg Englert and Nasser Metwally
|
Separability of entangled q-bit pairs
| null |
Journal of Modern Optics, vol. 47, 2000, pp. 2221-2231
|
10.1080/09500340008235144
| null |
quant-ph
| null |
The state of an entangled q-bit pair is specified by 15 numerical parameters
that are naturally regarded as the components of two 3-vectors and a
$3\times3$-dyadic. There are easy-to-use criteria to check whether a given pair
of 3-vectors plus a dyadic specify a 2-q-bit state; and if they do, whether the
state is entangled; and if it is, whether it is a separable state. Some
progress has been made in the search for analytical expressions for the degree
of separability. We report, in particular, the answer in the case of vanishing
3-vectors.
|
[
{
"version": "v1",
"created": "Sat, 18 Dec 1999 18:57:09 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Jan 2000 10:25:49 GMT"
}
] | 2015-06-26T00:00:00 |
[
[
"Englert",
"Berthold-Georg",
""
],
[
"Metwally",
"Nasser",
""
]
] |
quant-ph/9912090
|
Galina L. Klimchitskaya
|
V.B.Bezerra, G.L.Klimchitskaya, V.M.Mostepanenko
|
Higher order conductivity corrections to the Casimir force
|
15 pages, 4 figures
| null |
10.1103/PhysRevA.62.014102
| null |
quant-ph
| null |
The finite conductivity corrections to the Casimir force in two
configurations are calculated in the third and fourth orders in relative
penetration depth of electromagnetic zero oscillations into the metal. The
obtained analytical perturbation results are compared with recent computations.
Applications to the modern experiments are discussed.
|
[
{
"version": "v1",
"created": "Sun, 19 Dec 1999 20:09:26 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Bezerra",
"V. B.",
""
],
[
"Klimchitskaya",
"G. L.",
""
],
[
"Mostepanenko",
"V. M.",
""
]
] |
quant-ph/9912091
|
Frederic Faure
|
Frederic Faure and Boris Zhilinskii
|
Topological Chern indices in molecular spectra
|
4 pages, 3 figures
| null |
10.1103/PhysRevLett.85.960
| null |
quant-ph
| null |
Topological Chern indices are related to the number of rotational states in
each molecular vibrational band. Modification of the indices is associated to
the appearance of ``band degeneracies'', and exchange of rotational states
between two consecutive bands. The topological dynamical origin of these
indices is proven through a semi-classical approach, and their values are
computed in two examples. The relation with the integer quantum Hall effect is
briefly discussed.
|
[
{
"version": "v1",
"created": "Mon, 20 Dec 1999 15:08:44 GMT"
}
] | 2009-10-31T00:00:00 |
[
[
"Faure",
"Frederic",
""
],
[
"Zhilinskii",
"Boris",
""
]
] |
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