Matt's arXiv selection, Monday 9th January 2006.

From: Matthew Davis <>
Date: Fri, 13 Jan 2006 12:10:04 +1000 (EST)

Hi all,

Apologies for the lateness of this week's mailing - caused by the birth of
Juliette Davis on Monday!

I have now begun a mailing list for this service - to subscribe send a
message to

and in the body of the message have the command:

subscribe matts_arxiv

Please let your friends know that this exists - it would be nice to get a
big list of subscribers as some publicity for the Centre of Excellence.
I will be begining a webpage with an archive of mailings once my life gets
closer to being back to normal!


Dr M. J. Davis,               Senior Lecturer in Physics
School of Physical Sciences,  email:
University of Queensland,     ph   : +61 7 334 69824
Brisbane, QLD 4072,           fax  : +61 7 336 51242
Paper: cond-mat/0512693
Date: Thu, 29 Dec 2005 06:32:11 GMT   (45kb)
Title: Ferromagnetic phase transition in spinor Bose gases
Authors: Qiang Gu
Comments: 20 pages, 3 figures, Book chapter in "Progress in Ferromagnetic
   Research, Edited by V.N. Murray (Nova Science Publishers, New York, 2005)
Subj-class: Other; Superconductivity
   The achievement in cooling alkali atomic gases, such as $^{87}$Rb, $^{23}$Na
and $^{7}$Li, to quantum degeneracy opens up a way to study magnetism in spinor
bosons, because these constituent atoms usually have a hyperfine spin degree of
freedom. This article reviews several basic problems related to the
ferromagnetic phase transition in spinor atomic Bose gases from a theoretical
perspective. After a brief discussion on various possible origins of the
ferromagnetic interaction, the phase diagram of the ferromagnetically coupled
spinor bosons is investigated. It is found that the ferromagnetic transition
occurs always above Bose-Einstein condensation and the Bose condensate is fully
polarized. The low-lying collective excitations of the spinor condensate,
including spin and density modes, are discussed. The spectrum of the density
mode is of the Bogliubov form and the spin wave spectrum has a $k^2$-formed
dispersion relation at long wavelengths. The spin-wave stiffness coefficient
contains contribut
\\ ( ,  45kb)
Paper: cond-mat/0512716
Date: Fri, 30 Dec 2005 03:08:54 GMT   (128kb)
Title: Oscillations of Bose condensates in a one-dimensional optical
Authors: C. C. Huang, W. C. Wu
Comments: 5 pages,2 figures
Subj-class: Other
Journal-ref: PHYSICAL REVIEW A 72, 065601 (2005)
   Oscillations of atomic Bose-Einstein condensates in a 1D optical lattice with
a two-point basis is investigated. In the low-frequency regime, four branches
of modes are resolved, that correspond to the transverse in-phase and
out-of-phase breathing modes, and the longitudinal acoustic and optical phonon
modes of the condensates. Dispersions of these modes depend intimately on the
values of two intersite Josephson tunneling strengths, $J_1$ and $J_2$, and the
on-site repulsion $U$ between the atoms. Observation of these mode dispersions
is thus a direct way to access them.
\\ ( ,  128kb)
Paper: cond-mat/0511207
replaced with revised version Thu, 29 Dec 2005 19:12:25 GMT   (10kb)
Title: Quantum Statistics with Classical Particles
Authors: Daniel Gottesman
Comments: 5 pages. v2 adds one reference
Subj-class: Statistical Mechanics; Other
\\ ( ,  10kb)
Paper: quant-ph/0512248
Date: Thu, 29 Dec 2005 13:11:03 GMT   (111kb)
Title: Can quantum computing solve classically unsolvable problems?
Authors: Andrew Hodges
   T. D. Kieu has claimed that a quantum computing procedure can solve a
classically unsolvable problem. Recent work of W. D. Smith has shown that
Kieu's central mathematical claim cannot be sustained. Here, a more general
critique is given of Kieu's proposal and some suggestions are made regarding
the Church-Turing thesis.
\\ ( ,  111kb)
Paper: quant-ph/0512249
Date: Thu, 29 Dec 2005 14:07:21 GMT   (438kb)
Title: Ground state overlap, quantum phase transitions and the orthogonality
Authors: Paolo Zanardi and Nikola Paunkovi\'c
Comments: 4 pages
   We present a characterization of quantum phase transitions in terms of the
the overlap function between two ground states obtained for two different
values of external parameters. On the examples of the Dicke and XY models, we
show that the regions of criticality of a system are marked by the extremal
points of the overlap and functions closely related to it. Further, we discuss
the connections of this approach and with the Anderson orthogonality
catastrophe as well as with the dynamical study of the Loschmidt echo for
critical systems.
\\ ( ,  438kb)
Paper: quant-ph/0512250
Date: Thu, 29 Dec 2005 14:26:54 GMT   (79kb)
Title: Temperature effects on mixed state geometric phase
Authors: A. T. Rezakhani and P. Zanardi
Comments: 5 pages
   Geometric phase of an open quantum system in interaction with a thermal
environment is studied. To gain insight on how thermal effects can change
geometric phase we study some simple models. The system is considered to be a
simple spin-half particle which is interacting with a bath. These different
models generally show that GP can vary even when the system is weakly coupled
to environment. As the final example we consider the system under an
adiabatically time varying magnetic field which is weakly coupled to thermal
environment. An important feature of this model is that it reveals existence of
a temperature scale in which adiabaticity condition is preserved. This
temperature is exactly the one in which geometric phase vanishes.
\\ ( ,  79kb)
Paper: quant-ph/0512251
Date: Thu, 29 Dec 2005 15:27:29 GMT   (214kb)
Title: Entropy: An inherent, nonstatistical property of any system in any state
Authors: Elias P. Gyftopoulos
Comments: 13 pages
   Entropy is the distinguishing and most important concept of our efforts to
understand and regularize our observations of a very large class of natural
phenomena, and yet, it is one of the most contentious concepts of physics. In
this article, we review two expositions of thermodynamics, one without
reference to quantum theory, and the other quantum mechanical without
probabilities of statistical mechanics. In the first, we show that entropy is
an inherent property of any system in any state, and that its analytical
expression must conform to eight criteria. In the second, we recognize that
quantum thermodynamics: (i) admits quantum probabilities described either by
wave functions or by nonstatistical density operators; and (ii) requires a
nonlinear equation of motion that is delimited by but more general than the
Schroedinger equation, and that accounts for both reversible and irreversible
evolutions of the state of the system in time. Both the more general quantum
probabilities, and the equation of motion have been defined, and the three laws
of thermodynamics are shown to be theorems of this equation.
\\ ( ,  214kb)
Paper: quant-ph/0512259
Date: Fri, 30 Dec 2005 20:42:27 GMT   (524kb)
Title: Experimental Constraints of Using Slow-Light in Sodium Vapor for
   Light-Drag Enhanced Relative Rotation Sensing
Authors: Renu Tripathi, G.S. Pati, M. Messall, K. Salit and M.S. Shahriar
Comments: 18 pages, 8 figures
   We report on experimental observation of electromagnetically induced
transparency and slow-light (vg ~ c/607) in atomic sodium vapor, as a potential
medium for a recently proposed experiment on slow-light enhanced relative
rotation sensing [11]. We have performed an interferometric measurement of the
index variation associated with a two-photon resonance to estimate the
dispersion characteristics of the medium that is relevant to the slow-light
based rotation sensing scheme. We also show that the presence of
counter-propagating pump beams in an optical Sagnac loop produces a backward
optical phase conjugation beam that can generate spurious signals, which may
complicate the measurement of small rotations in the slow-light enhanced
gyroscope. We identify techniques for overcoming this constraint.
\\ ( ,  524kb)
Paper: quant-ph/0512260
Date: Fri, 30 Dec 2005 20:52:22 GMT   (434kb)
Title: Controllable Anomalous Dispersion and Group Index Nulling via
   Bi-Frequency Raman Gain in Rb Vapor for application to Ultraprecision
   Rotation Sensing
Authors: G.S. Pati, Renu Tripathi, M. Messall, K. Salit and M.S. Shahriar
Comments: 23 pages, 9 figures
   We have recently proposed [9], the use of fast-light media to obtain
ultrahigh precision rotation sensing capabilities. The scheme relies on
producing a critically anomalous dispersion, in a suitable dispersive medium,
which is introduced in the arms of a Sagnac interferometer. We present here an
experimental investigation of the anomalous dispersion properties of
bi-frequency Raman gain in rubidium vapor, with the goal of using this medium
for producing the critically anomalous dispersion condition. A heterodyne phase
measurement technique is used to measure accurately the index variation
associated with the dispersion. The slope of the negative linear dispersion (or
group index) is experimentally varied by more than two orders of magnitude
while changing the frequency separation between pump fields, responsible for
producing gain. Using this result, we have identified the experimental
parameters for achieving a null value of the group index, corresponding to the
critically anomalous dispersion condition necessary for enhanced rotational
\\ ( ,  434kb)
Paper: cond-mat/0601004
Date: Sat, 31 Dec 2005 15:13:34 GMT   (75kb)
Title: Theory of matter wave beam splitters in gravito-inertial and trapping
Authors: Charles Antoine, Christian J. Borde
Comments: 33 pages, 5 figures
Subj-class: Other
   We present a strong field theory of matter wave splitting in the presence of
various gravitational, inertial and trapping potentials. The effect of these
potentials on the resonance condition (between the splitting potential and the
considered effective two-level system) and on the atomic Borrmann effect is
investigated in detail. The dispersive structuring of an incident atomic wave
packet - due to such generalized beam splitters - is studied and modeled, and
several important dynamical features of the solutions are detailed (generalized
Rabi oscillations, velocity selection, anomalous dispersion, generalized
Borrmann effect and anomalous gravitational bending). Finally, we show how to
express this triple interaction "matter - splitting potential -
gravito-inertial and trapping potentials" as an equivalent instantaneous
interaction which turns out to be a very efficient tool for the modeling of
atom interferometers.
\\ ( ,  90kb)
Paper: cond-mat/0601006
Date: Sat, 31 Dec 2005 18:57:24 GMT   (69kb)
Title: Trapped Fermions across a Feshbach resonance with population imbalance
Authors: W. Yi and L.-M. Duan
Comments: 5 pages, 4 figures
Subj-class: Other
   We investigate the phase separation of resonantly interacting fermions in a
trap with imbalanced spin populations, both at zero and at finite temperatures.
We directly minimize the thermodynamical potential under the local density
approximation instead of using the gap equation, as the latter may give
unstable solutions. On the BEC side of the resonance, one may cross three
different phases from the trap center to the edge; while on the BCS side or at
resonance, typically only two phases show up. We compare our results with the
recent experiment, and the agreement is remarkable.
\\ ( ,  69kb)
Paper: cond-mat/0601011
Date: Sun, 1 Jan 2006 19:39:05 GMT   (303kb)
Title: Spin noise spectroscopy to probe quantum states of ultracold fermionic
   atomic gases
Authors: Bogdan Mihaila, Scott A. Crooker, Krastan B. Blagoev, Dwight G.
   Rickel, Peter B. Littlewood, and Darryl L. Smith
Report-no: LAUR 05-9176
Subj-class: Other; Superconductivity
   Ultracold alkali atoms provide experimentally accessible model systems for
probing quantum states that manifest themselves at the macroscopic scale.
Recent experimental realizations of superfluidity in dilute gases of ultracold
fermionic (half-integer spin) atoms offer exciting opportunities to directly
test theoretical models of related many-body fermion systems that are
inaccessible to experimental manipulation, such as neutron stars and
quark-gluon plasmas. However, the microscopic interactions between fermions are
potentially quite complex, and experiments in ultracold gases to date cannot
clearly distinguish between the qualitatively different microscopic models that
have been proposed. Here, we theoretically demonstrate that optical
measurements of electron spin noise -- the intrinsic, random fluctuations of
spin -- can probe the entangled quantum states of ultracold fermionic atomic
gases and unambiguously reveal the detailed nature of the interatomic
interactions. We show that different models predict different sets of
resonances in the noise spectrum, and once the correct effective interatomic
interaction model is identified, the line-shapes of the spin noise can be used
to constrain this model. Further, experimental measurements of spin noise in
classical (Boltzmann) alkali vapors are used to estimate the expected signal
magnitudes for spin noise measurements in ultracold atom systems and to show
that these measurements are feasible.
\\ ( ,  303kb)
Paper: cond-mat/0601014
Date: Mon, 2 Jan 2006 03:06:29 GMT   (178kb)
Title: Topological Phase Transition Theory of Strongly Correlated Many Body
Authors: Tieyan Si
Comments: 14 pages
Subj-class: Statistical Mechanics; Strongly Correlated Electrons
   We developed a systematic topological phase transition theory and proposed
quantum phase transition of higher order. This topological phase transition
theory shows that, when the system jumps from p th order phase transition to
(p+1)th or (p-1)th order phase transition, there is a substantial change of the
topology of the configuration space. We found an universal equation of
coexistence curve in phase diagram, this equation unified the previous
different special coexistence equations for different order phase transition.
   From this coexistence curve equation, one can arrive the phase diagram of any
order phase transition, it holds both for classical and quantum phase
transition. We also generalized Landau theory of phase transition, and proposed
a new definition of the order of phase transition. As an application, we take
the Bose-Hubbard model as an example to demonstrate how to use this method to
study the quantum phase transition. We depict the first order phase diagram, it
is in agreement with recent progress. Since the higher-order quantum phase
transition in condensed matter physics is still virgin, we proposed the
equation of the second order and higher-order phase diagram of quantum phase
transition in optical lattice and expected an experimental verify. Further
more, the equation of the phase diagram for a multicomponent Bose-Einstein
condensate in optical lattice is also studied. We also proposed that the order
of a quantum phase transition is determined by the subgroup chain of the
\\ ( ,  178kb)
Paper: cond-mat/0601018
Date: Mon, 2 Jan 2006 09:28:45 GMT   (48kb)
Title: Analog of photon-assisted tunneling in a Bose-Einstein condensate
Authors: Andre Eckardt, Tharanga Jinasundera, Christoph Weiss and Martin
Comments: 4 pages, 4 figures, RevTeX
Subj-class: Other
Journal-ref: Phys. Rev. Lett. 95, 200401 (2005)
DOI: 10.1103/PhysRevLett.95.200401
   We study many-body tunneling of a small Bose-Einstein condensate in a
periodically modulated, tilted double-well potential. Periodic modulation of
the trapping potential leads to an analog of photon-assisted tunneling, with
distinct signatures of the interparticle interaction visible in the amount of
particles transferred from one well to the other. In particular, under
experimentally accessible conditions there exist well-developed half-integer
Shapiro-like resonances.
\\ ( ,  48kb)
Paper: cond-mat/0601020
Date: Mon, 2 Jan 2006 09:34:10 GMT   (119kb)
Title: Superfluid-insulator transition in a periodically driven optical lattice
Authors: Andre Eckardt, Christoph Weiss and Martin Holthaus
Comments: 4 pages, 4 figures, RevTeX
Subj-class: Other
Journal-ref: Phys. Rev. Lett. 95, 260404 (2005)
DOI: 10.1103/PhysRevLett.95.260404
   We demonstrate that the transition from a superfluid to a Mott insulator in
the Bose-Hubbard model can be induced by an oscillating force through an
effective renormalization of the tunneling matrix element. The mechanism
involves adiabatic following of Floquet states, and can be tested
experimentally with Bose-Einstein condensates in periodically driven optical
lattices. Its extension from small to very large systems yields nontrivial
information on the condensate dynamics.
\\ ( ,  119kb)
Paper: cond-mat/0601032
Date: Mon, 2 Jan 2006 17:18:10 GMT   (15kb)
Title: Imaging of critical correlations in optical lattices and atomic traps
Authors: Qian Niu, Iacopo Carusotto, and A. B. Kuklov
Comments: 7 revtex pages, no figures
Subj-class: Other
   We suggest real space determination of diverging space-time correlations upon
approaching a continuous phase transition within the paradigm of finite size
scaling. The method relies on interference of an atomic cloud released from the
optical lattice (or from the trap) with some reference Bose-Einstein
condensate. As opposed to the standard absorptive imaging technique, the
proposed one allows imaging of atomic many body {\it wavefunction} in the
lattice (or in the trap) by projecting it on coherent states of the reference
cloud. The advantage of this method is that the correlation properties of the
interference pattern are robust with respect to expansion and are not,
practically, affected by underlying lattice. The non-destructive scheme allows,
in principle, measuring the space-time correlators of arbitrary order.
\\ ( ,  15kb)
Paper: cond-mat/0511641
replaced with revised version Mon, 2 Jan 2006 13:57:06 GMT   (40kb)
Title: Quantum criticality of a Fermi gas with a spherical dispersion minimum
Authors: Kun Yang and Subir Sachdev
Comments: 4 pages, 1 figure; (v2) added clarifications in response to comments
Subj-class: Strongly Correlated Electrons; Superconductivity
\\ ( ,  40kb)
Paper: quant-ph/0601009
Date: Mon, 2 Jan 2006 11:07:50 GMT   (21kb)
Title: Notes on phase space quantization
Authors: J. Kiukas, P. Lahti, K. Ylinen
Comments: 21 pages, submitted to Journal of Mathematical Physics
   We consider questions related to a quantization scheme in which a classical
variable f:\Omega\to R on a phase space \Omega is associated with a
semispectral measure E^f, such that the moment operators of E^f are required to
be of the form \Gamma(f^k), with \Gamma a suitable mapping from the set of
classical variables to the set of (not necessarily bounded) operators in some
Hilbert space. In particular, we investigate the situation where the map \Gamma
is implemented by the operator integral with respect to some fixed positive
operator measure. The phase space \Omega is first taken to be an abstract
measurable space, then a locally compact unimodular group, and finally R^2,
where we determine explicitly the relevant operators \Gamma(f^k) for certain
variables f, in the case where the quantization map \Gamma is implemented by a
translation covariant positive operator measure. In addition, we consider the
question under what conditions a positive operator measure is projection
\\ ( ,  21kb)
Paper: cond-mat/0601036
Date: Tue, 3 Jan 2006 07:24:34 GMT   (22kb)
Title: Electron-like and photon-like excitations in an ultracold Bose-Fermi
   atom mixture
Authors: Yue Yu and S. T. Chui
Comments: Supersede cond-mat/0510339
Subj-class: Other; Strongly Correlated Electrons
   We show that the electron-like and photon-like excitations may exist in a
three-dimensional Bose-Fermi Hubbard model describing ultracold Bose-Fermi atom
mixtures in optical lattices. In a Mott insulating phase of the Bose atoms,
these excitations are stabilized by an induced repulsive interaction between
'electrons' if the Fermi atoms are nearly half filling. We suggest to create
'external electric field' so that the electron-like excitation can be observed
by measuring the linear density-density response of the 'electron' gas to the
'external field' in a time-of-flight experiment of the mixture. The Fermi
surface of the 'electron' gas may also be expected to be observed in the
\\ ( ,  22kb)
Paper: cond-mat/0601044
Date: Tue, 3 Jan 2006 11:03:42 GMT   (41kb)
Title: Coherent control of population transfer between communicating defects
Authors: Christoph Weiss
Comments: 7 pages, 6 figures, to appear in Phys. Rev. B
Subj-class: Other
   Population transfer between two identical, communicating defects in a
one-dimensional tight-binding lattice can be systematically controlled by
external time-periodic forcing. Employing a force with slowly changing
amplitude, the time it takes to transfer a particle from one defect to the
other can be altered over several orders of magnitude. An analytical expression
is derived which shows how the forcing effectively changes the energy splitting
between the defect states, and numerical model calculations illustrate the
possibility of coherent control of the transfer.
\\ ( ,  41kb)
Paper: cond-mat/0601045
Date: Tue, 3 Jan 2006 12:14:03 GMT   (200kb)
Title: Fermionic atoms with tunable interactions in a 3D optical lattice
Authors: Thilo St\"oferle, Henning Moritz, Christian Schori, Kenneth G\"unter,
   Michael K\"ohl, Tilman Esslinger
Comments: 8 pages, 3 figures
Subj-class: Strongly Correlated Electrons
Journal-ref: Proceedings of the XVII International Conference on Laser
   Spectroscopy, World Scientific Publishing, 2005, p. 283
   We report on the realization of a quantum degenerate atomic Fermi gas in an
optical lattice. Fermi surfaces of noninteracting fermions are studied in a
three-dimensional lattice. Using a Feshbach resonance, we observe a coupling of
the Bloch bands in the strongly interacting regime.
\\ ( ,  200kb)
Paper: cond-mat/0601054
Date: Tue, 3 Jan 2006 18:26:53 GMT   (1672kb)
Title: Experimental realization of BCS-BEC crossover physics with a Fermi gas
   of atoms
Authors: C. Regal and D. S. Jin
Comments: Cindy Regal's Ph.D. thesis, 152 pages, 68 figures; a portion of this
   manuscript will appear in Vol. 43 of "Advances in Atomic, Molecular, and
   Optical Physics"
Subj-class: Other
   This thesis presents experiments probing physics in the crossover between
Bose-Einstein condensation (BEC) and BCS superconductivity using an ultracold
gas of atomic fermions. Scattering resonances in these ultracold gases (known
as Feshbach resonances) provide the unique ability to tune the fermion-fermion
interactions. The work presented here pioneered the use of fermionic Feshbach
resonances as a highly controllable and tunable system ideal for studying the
cusp of the BCS-BEC crossover problem. Here pairs of fermionic atoms have some
properties of diatomic molecules and some properties of Cooper pairs. I present
studies of a normal Fermi gas at a Feshbach resonance and the work required to
cool the gas to temperatures where superfluidity in the crossover is predicted.
These studies culminated in our observation of a phase transition at the cusp
of the BCS-BEC crossover through condensation of fermionic atom pairs. I also
discuss subsequent work that confirmed the crossover nature of the pairs in
these condensates.
\\ ( ,  1672kb)
Paper: cond-mat/0508778
replaced with revised version Tue, 3 Jan 2006 00:07:30 GMT   (441kb)
Title: Observing the Profile of an Atom Laser Beam
Authors: M. K\"ohl, Th. Busch, K. Molmer, T. W. H\"ansch, T. Esslinger
Comments: 4 pages, 4 figures
Subj-class: Other
Journal-ref: Phys. Rev. A 72, 063618 (2005)
DOI: 10.1103/PhysRevA.72.063618
\\ ( ,  441kb)
Paper: quant-ph/0601012
Date: Tue, 3 Jan 2006 03:36:20 GMT   (640kb)
Title: Two-Mode Theory of BEC Interferometry
Authors: B J Dalton
Comments: Four figures (7 files)
   A theory of BEC interferometry in an unsymmetrical double-well trap has been
developed for small boson numbers, based on the two-mode approximation. The
bosons are initially in the lowest mode of a single well trap, which is split
into a double well and then recombined. Possible fragmentations into separate
BEC states in each well during the splitting/recombination process are allowed
for. The BEC is treated as a giant spin system, the fragmented states are
eigenstates of S^2 and Sz. Self-consistent sets of equations for the amplitudes
of the fragmented states and for the two single boson mode functions are
obtained. The latter are coupled Gross-Pitaevskii equations. Interferometric
effects may be measured via boson numbers in the first excited mode
\\ ( ,  640kb)
Paper: cond-mat/0601045
replaced with revised version Wed, 4 Jan 2006 12:12:34 GMT   (200kb)
Title: Fermionic atoms with tunable interactions in a 3D optical lattice
Authors: Thilo St\"oferle, Henning Moritz, Christian Schori, Kenneth G\"unter,
   Michael K\"ohl, Tilman Esslinger
Comments: 8 pages, 3 figures; v2: updated references
Subj-class: Strongly Correlated Electrons
Journal-ref: Proceedings of the XVII International Conference on Laser
   Spectroscopy, World Scientific Publishing, 2005, p. 283
\\ ( ,  200kb)
Paper: quant-ph/0507227
replaced with revised version Wed, 4 Jan 2006 08:09:29 GMT   (24kb)
Title: Violating Bell Inequalities Maximally for Two $d$-Dimensional Systems
Authors: Jing-Ling Chen, Chunfeng Wu, L. C. Kwek, C. H. Oh, Mo-Lin Ge
Comments: 6 pages, 1 figure. Revised version
\\ ( ,  24kb)
Paper: quant-ph/0601029
Date: Wed, 4 Jan 2006 22:35:42 GMT   (770kb)
Title: Generating controllable atom-light entanglement with a Raman atom laser
Authors: S. A. Haine, M. K. Olsen, J. J. Hope
Comments: 4 pages, 4 figures
   We introduce a scheme for creating continuous variable entanglement between
an atomic beam and an optical field, by using squeezed light to outcouple atoms
from a BEC via a Raman transition. We model the full multimode dynamics of the
atom laser beam and the squeezed optical field, and show that with appropriate
two-photon detuning and two-photon Rabi frequency, the transmitted light is
entangled in amplitude and phase with the outcoupled atom laser beam. The
degree of entanglement is controllable via changes in the two-photon Rabi
frequency of the outcoupling process.
\\ ( ,  770kb)
Paper: quant-ph/0510019
replaced with revised version Thu, 5 Jan 2006 14:16:10 GMT   (8kb)
Title: Detection of N-particle entanglement with generalized Bell inequalities
Authors: Wieslaw Laskowski, Marek Zukowski
Comments: 5 pages, minor typos corrected, journal version
Journal-ref: Phys. Rev. A 72, 062112 (2005)
\\ ( ,  8kb)
Paper: physics/0508058
replaced with revised version Wed, 4 Jan 2006 05:30:40 GMT   (104kb)
Title: Collisions of ultracold atoms in dc electric fields
Authors: R. V. Krems
Subj-class: Atomic Physics; Chemical Physics
\\ ( ,  104kb)
Received on Fri Jan 13 2006 - 12:10:04 EST

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