From: Matthew Davis <mdavis_at_physics.uq.edu.au>

Date: Tue, 3 Jan 2006 08:50:31 +1000 (EST)

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

Comments: 2 pages, 1 figure

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

Comments: 5 pages, no figure

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

Comments: 11 pages, 4 figures

\\

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

Comments: 6 pages, 3 figures

\\

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

Comments: 4 pages, 1 figure

\\

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

Comments: 8 pages, 20 figures

\\ ( 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

Authors: H.H. Adamyan, N.H. Adamyan, S.B. Manvelyan, G.Yu. Kryuchkyan

Comments: Subm. to PRA

\\

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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