First-principles quantum simulations of dissociation of molecular condensates: Atom correlations in momentum space

Savage, C. M., Schwenn, P. E. and Kheruntsyan, K. V. (2006) First-principles quantum simulations of dissociation of molecular condensates: Atom correlations in momentum space. Physical Review A, 74 3: 033620-1-033620-16. doi:10.1103/PhysRevA.74.033620

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Author Savage, C. M.
Schwenn, P. E.
Kheruntsyan, K. V.
Title First-principles quantum simulations of dissociation of molecular condensates: Atom correlations in momentum space
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2006-09-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.74.033620
Open Access Status File (Publisher version)
Volume 74
Issue 3
Start page 033620-1
End page 033620-16
Total pages 16
Editor Gordon W.F. Drake
Margaret Molloy
Place of publication College Pk
Publisher American Physical Society
Collection year 2006
Language eng
Subject C1
240402 Quantum Optics and Lasers
780102 Physical sciences
Abstract We investigate the quantum many-body dynamics of dissociation of a Bose-Einstein condensate of molecular dimers into pairs of constituent bosonic atoms and analyze the resulting atom-atom correlations. The quantum fields of both the molecules and atoms are simulated from first principles in three dimensions using the positive-P representation method. This allows us to provide an exact treatment of the molecular field depletion and s-wave scattering interactions between the particles, as well as to extend the analysis to nonuniform systems. In the simplest uniform case, we find that the major source of atom-atom decorrelation is atom-atom recombination which produces molecules outside the initially occupied condensate mode. The unwanted molecules are formed from dissociated atom pairs with nonopposite momenta. The net effect of this process-which becomes increasingly significant for dissociation durations corresponding to more than about 40% conversion-is to reduce the atom-atom correlations. In addition, for nonuniform systems we find that mode mixing due to inhomogeneity can result in further degradation of the correlation signal. We characterize the correlation strength via the degree of squeezing of particle number-difference fluctuations in a certain momentum-space volume and show that the correlation strength can be increased if the signals are binned into larger counting volumes.
Keyword Optics
Physics, Atomic, Molecular & Chemical
Bose-einstein Condensate
Positive P Representation
Podolsky-rosen Paradox
Mechanical Description
Stochastic Gauges
Physical Reality
Fermi Gas
Coherence
Dynamics
Solitons
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 18:46:06 EST