304 research outputs found
Wave packet dynamics of the matter wave field of a Bose-Einstein condensate
We show in the framework of a tractable model that revivals and fractional
revivals of wave packets afford clear signatures of the extent of departure
from coherence and from Poisson statistics of the matter wave field in a
Bose-Einstein condensate, or of a suitably chosen initial state of the
radiation field propagating in a Kerr-like medium.Comment: 10 pages, 4 figures, RevTeX
Shell-Model Monte Carlo Simulations of BCS-BEC Crossover in Few-Fermion Systems
We study a trapped system of fermions with a zero-range two-body interaction
using the shell-model Monte Carlo method, providing {\em ab initio} results for
the low particle number limit where mean-field theory is not applicable. We
present results for the -body energies as function of interaction strength,
particle number, and temperature. The subtle question of renormalization in a
finite model space is addressed and the convergence of our method and its
applicability across the BCS-BEC crossover is discussed. Our findings indicate
that very good quantitative results can be obtained on the BCS side, whereas at
unitarity and in the BEC regime the convergence is less clear. Comparison to
N=2 analytics at zero and finite temperature, and to other calculations in the
literature for show very good agreement.Comment: 6 pages, 5 figures, Revtex4, final versio
Light-Matter Quantum Interface
We propose a quantum interface which applies multiple passes of a pulse of
light through an atomic sample with phase/polarization rotations in between the
passes. Our proposal does not require nonclassical light input or measurements
on the system, and it predicts rapidly growing unconditional entanglement of
light and atoms from just coherent inputs. The proposed interface makes it
possible to achieve a number of tasks within quantum information processing
including teleportation between light and atoms, quantum memory for light and
squeezing of atomic and light variables.Comment: 4 pages, 4 figure
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