# Matt's arXiV selection, Monday 2nd January 2006.

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Tue, 3 Jan 2006 08:50:31 +1000 (EST)

Happy New Year everyone!

I'm moving my arXiV selection email to Mondays... the emails arrive a
little late on Fridays to process and get it out.

See you,
Matt.

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Paper: physics/0512207
Date: Thu, 22 Dec 2005 05:08:12 GMT (476kb)

Title: Three-body systems with attractive 1/r potentials
Authors: J. P. D'Incao, S. C. Cheng, H. Suno and B. D. Esry
Subj-class: Atomic Physics
\\
We have used the hyperspherical adiabatic representation to describe the
system of three identical bosons in an spin stretched state interacting by an
attractive 1/r potential. A proposal has been made how such a system might be
realized experimentally in cold trapped atoms using extremely off-resonant
laser fields [Phys. Rev. Lett. 84, 5687 (2000)]. We have obtained effective
potentials, channel functions, and nonadiabatic couplings for this gravity-like
interaction, allowing us to calculate the ground state energy with accuracy
that substantially improves upon previous results. We have similarly calculated
the energies for the first four 0^+ excited states. These results show that the
simple adiabatic hyperspherical approximation offers an accurate description
for such a system.
\\ ( http://arXiv.org/abs/physics/0512207 , 476kb)
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Paper: physics/0512214
Date: Thu, 22 Dec 2005 12:50:30 GMT (19kb)

Title: To the possibility of the "slow light" in the waveguides
Authors: G. G. Kozlov
Subj-class: Optics; Atomic Physics
\\
The atoms moving within the waveguide with a critical frequency higher than
the resonant frequency of atoms are suggested for obtaining the "slow light".
Due to the absence of the resonant mode in the guide the atoms conserves
excitation and coherence. The speed of this mixed excitation (electromagnetic
field + moving atom) can be very low or even zero. The atoms moving within the
waveguide with a critical frequency higher than the resonant frequency of atoms
are suggested for obtaining the "slow light". Due to the absence of the
resonant mode in the guide the atoms conserves excitation and coherence. The
speed of this mixed excitation (electromagnetic field + moving atom) can be
very low or even zero.
\\ ( http://arXiv.org/abs/physics/0512214 , 19kb)
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Paper: cond-mat/0512596
Date: Thu, 22 Dec 2005 21:17:27 GMT (68kb)

Title: Understanding the superfluid phase diagram in trapped Fermi gases
Authors: Qijin Chen, C. A. Regal, M. Greiner, D. S. Jin, and K. Levin
Comments: 4 pages, 3 figures, submitted to PRA Rapid
Subj-class: Strongly Correlated Electrons; Superconductivity
\\
Trapped ultracold Fermi gases provide a system that can be tuned between the
BCS and BEC regimes by means of a magnetic-field Feshbach resonance.
Condensation of fermionic atom pairs in a $^{40}$K gas was demonstrated
experimentally by a sweep technique that pairwise projects fermionic atoms onto
molecules. In this paper we examine previous data obtained with this technique
that probed the phase boundary in the temperature-magnetic field plane.
Comparison of the $^{40}$K data to a theoretically computed phase diagram
demonstrates good agreement between the two.
\\ ( http://arXiv.org/abs/cond-mat/0512596 , 68kb)
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Paper: cond-mat/0512605
Date: Fri, 23 Dec 2005 10:15:45 GMT (244kb)

Title: Mean-field algebraic approach to the dynamics of fermions in a 1D
optical lattice
Authors: F. P. Massel, V. Penna
Comments: 10 pages, 2 figures, submitted to J. Phys. B, Cortona BEC 2005
special issue
Subj-class: Other
\\
We consider a one-dimensional optical lattice of three-dimensional Harmonic
Oscillators which are loaded with neutral fermionic atoms trapped into two
hyperfine states. By means of a standard variational coherent-state procedure,
we derive an effective Hamiltonian for this quantum model and the hamiltonian
equations describing its evolution. To this end, we identify the algebra
$\mathcal L$ of two-fermion operators --describing the relevant microscopic
quantum processes of our model-- whereby the natural choice for the trial state
appears to be a so(2r) coherent state. The coherent-state parameters, playing
the role of dynamical variables for the effective Hamiltonian, are shown to
identify with the $\mathcal L$-operator expectation values thus providing a
clear physical interpretation of this algebraic mean-field picture.
\\ ( http://arXiv.org/abs/cond-mat/0512605 , 244kb)
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Paper: cond-mat/0510721
replaced with revised version Fri, 23 Dec 2005 06:48:06 GMT (16kb)

Title: Collective modes of Fermi superfluid containing vortices along the
BEC-BCS crossover
Authors: Tarun Kanti Ghosh and Kazushige Machida
Comments: To appear in Physical Review A
Subj-class: Mesoscopic Systems and Quantum Hall Effect; Superconductivity
\\ ( http://arXiv.org/abs/cond-mat/0510721 , 16kb)
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Paper: cond-mat/0512548
replaced with revised version Fri, 23 Dec 2005 11:13:00 GMT (9kb)

Title: Boson dominance in finite and infinite fermion systems
Authors: Fabrizio Palumbo
Subj-class: Superconductivity
\\ ( http://arXiv.org/abs/cond-mat/0512548 , 9kb)
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Paper: quant-ph/0512221
Date: Fri, 23 Dec 2005 18:09:23 GMT (356kb)

Title: Coherent generation of EPR-entangled light pulses mediated by a single
trapped atom
Authors: Giovanna Morigi, J\"urgen Eschner, Stefano Mancini, and David Vitali
\\
We show that a single, trapped, laser-driven atom in a high-finesse optical
cavity allows for the quantum-coherent generation of entangled light pulses on
demand. Schemes for generating simultaneous and temporally separated pulse
pairs are proposed. The mechanical effect of the laser excitation on the
quantum motion of the cold trapped atom mediates the entangling interaction
between two cavity modes and between the two subsequent pulses, respectively.
The entanglement is of EPR-type, and its degree can be controlled through
external parameters. At the end of the generation process the atom is
decorrelated from the light field. Possible experimental implementations of the
proposals are discussed.
\\ ( http://arXiv.org/abs/quant-ph/0512221 , 356kb)
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Paper: quant-ph/0512222
Date: Fri, 23 Dec 2005 19:34:30 GMT (173kb)

Title: Anisotropic Spin Models with Polar Molecules in Optical Lattices
Authors: A. Micheli, G.K. Brennen, and P. Zoller
\\
Motivated by theoretical discoveries of emergent exotic phases from local
spin interactions we show how to simulate a broad class of lattice spin models
in one or more dimensions using trapped polar molecules in an optical lattice.
The spin corresponds to electronic degrees of freedom of a molecule in its
ground rotational state. Spin dependent couplings between molecules are
obtained using a microwave field to mix ground states with dipole-dipole
coupled rotationally excited states. The interaction strengths are fast
relative to decoherence times and any permutation symmetric two spin coupling
is designable using several microwave fields. We illustrate how to build two
models: one on a 2D square lattice with an energy gap providing for protected
quantum memory, and another on stacked triangular lattices leading to
topological quantum computing.
\\ ( http://arXiv.org/abs/quant-ph/0512222 , 173kb)
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Paper: cond-mat/0512628
Date: Sat, 24 Dec 2005 05:40:45 GMT (77kb)

Title: Effective field theory of boson-fermion mixtures and bound fermion
states on a vortex of boson superfluid
Authors: Yusuke Nishida and Dam Thanh Son
Comments: 13 pages, 4 figures, revtex4
Report-no: INT-PUB 05-31, TKYNT-05-31
Subj-class: Other
\\
We construct a Galilean invariant low-energy effective field theory of
boson-fermion mixtures and study bound fermion states on a vortex of boson
superfluid. We derive a simple criterion to determine for which values of the
fermion angular momentum l there exists an infinite number of bound energy
levels. We apply our formalism to two boson-fermion mixed systems: the dilute
solution of He3 in He4 superfluid and the cold polarized Fermi gas on the BEC
side of the "splitting point". For the He3-He4 mixture, we determine parameters
of the effective theory from experimental data as functions of pressure. We
predict that infinitely many bound He3 states on a superfluid vortex with
l=-2,-1,0 are realized in a whole range of pressure, 0\sim20 atm, where
experimental data are available. As for the cold polarized Fermi gas, while
only S-wave (l=0) and P-wave (l=\pm1) bound fermion states are possible in the
BEC limit, those with higher negative angular momentum become available as one
moves away from the BEC limit.
\\ ( http://arXiv.org/abs/cond-mat/0512628 , 77kb)
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Paper: quant-ph/0512226
Date: Sat, 24 Dec 2005 13:12:16 GMT (333kb)

Title: Efficient quantum memory and entanglement between light and an atomic
ensemble using magnetic fields
Authors: Christine A. Muschik, Klemens Hammerer, Eugene S. Polzik, J. Ignacio
Cirac
\\
We present two protocols, one for the storage of light in an atomic ensemble
and the subsequent retrieval, and another one for the generation of
entanglement between light and atoms. They rely on two passes of a single pulse
through the ensemble, Larmor precessing in an external field. Both protocols
work deterministically and the relevant figures of merit - such as the fidelity
or the EPR variance - scale exponentially in the coupling strength. We solve
the corresponding Maxwell-Bloch equations describing the scattering process and
determine the resulting input-output relations which only involve one relevant
light mode that, in turn, can be easily accessed experimentally.
\\ ( http://arXiv.org/abs/quant-ph/0512226 , 333kb)
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Paper: quant-ph/0512234
Date: Mon, 26 Dec 2005 02:00:52 GMT (14kb)

Title: Spatially Separated and Correlated Atom-molecule Lasers from a Bose
Condensate
Authors: Hui Jing, Wei Cai, Jing-Jun Xu and Ming-Sheng Zhan
\\
We propose a feasible scheme to create two spatially separated atomic and
molecular beams from an atomic Bose-Einstein condensate by combining the
Raman-type atom laser output and the two-color photo-association processes. We
examine the quantum dynamics and statistical properties of the system under
short-time limits, especially the quadrature-squeezed and mode-correlated
behaviors of two output beams for different initial state of the condensate.
The possibility to generate the entangled atom-molecule lasers by an optical
technique was also discussed.
\\ ( http://arXiv.org/abs/quant-ph/0512234 , 14kb)
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Paper: quant-ph/0512056
replaced with revised version Mon, 26 Dec 2005 09:55:26 GMT (101kb)

Title: Paramagnetic Faraday rotation with spin-polarized ytterbium atoms
Authors: M. Takeuchi, T. Takano, S. Ichihara, Y. Takasu, M. Kumakura, T.
Yabuzaki and Y. Takahashi
\\ ( http://arXiv.org/abs/quant-ph/0512056 , 101kb)
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Paper: cond-mat/0511052
replaced with revised version Wed, 28 Dec 2005 17:23:48 GMT (227kb)

Title: Einstein-de Haas Effect in Dipolar Bose-Einstein Condensates
Authors: Yuki Kawaguchi, Hiroki Saito, and Masahito Ueda
Comments: 4 pages, 4 figures; Revised version
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0511052 , 227kb)
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Paper: quant-ph/0512237
Date: Wed, 28 Dec 2005 17:03:11 GMT (582kb)

Title: Quadrature entanglement and photon-number correlations accompanied by
phase-locking
\\
We investigate quantum properties of phase-locked light beams generated in a
nondegenerate optical parametric oscillator (NOPO) with an intracavity
waveplate. This investigation continuous our previous analysis presented in
Phys.Rev.A 69, 05814 (2004), and involves problems of continuous-variable
quadrature entanglement in the spectral domain, photon-number correlations as
well as the signatures of phase-locking in the Wigner function. We study the
role of phase-localizing processes on the quantum correlation effects. The
peculiarities of phase-locked NOPO in the self-pulsing instability operational
regime are also cleared up. The results are obtained in both the
P-representation as a quantum-mechanical calculation in the framework of
stochastic equations of motion, and also by using numerical simulation based on
the method of quantum state diffusion.
\\ ( http://arXiv.org/abs/quant-ph/0512237 , 582kb)
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Received on Tue Jan 03 2006 - 08:50:31 EST

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