Quantum depletion of collapsing Bose-Einstein condensates

Sebastian Wüster, Beata J. Dąbrowska-Wüster, Ashton S. Bradley, Matthew J. Davis, P. Blair Blakie, Joseph J. Hope, and Craig M. Savage
Phys. Rev. A 75, 043611 – Published 17 April 2007

Abstract

We perform the first numerical three-dimensional studies of quantum field effects in the Bosenova experiment on collapsing condensates by E. Donley et al. [Nature (London) 415, 39 (2002)] using the exact experimental geometry. In a stochastic truncated Wigner simulation of the collapse, the collapse times are larger than the experimentally measured values. We find that a finite temperature initial state leads to an increased creation rate of uncondensed atoms, but not to a reduction of the collapse time. A comparison of the time-dependent Hartree-Fock-Bogoliubov and Wigner methods for the more tractable spherical trap shows excellent agreement between the uncondensed populations. We conclude that the discrepancy between the experimental and theoretical values of the collapse time cannot be explained by Gaussian quantum fluctuations or finite temperature effects.

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  • Received 18 September 2006

DOI:https://doi.org/10.1103/PhysRevA.75.043611

©2007 American Physical Society

Authors & Affiliations

Sebastian Wüster1, Beata J. Dąbrowska-Wüster2, Ashton S. Bradley3, Matthew J. Davis3, P. Blair Blakie4, Joseph J. Hope1, and Craig M. Savage1

  • 1ARC Centre of Excellence for Quantum-Atom Optics, Department of Physics, Faculty of Science, Australian National University, Canberra ACT 0200, Australia
  • 2ARC Centre of Excellence for Quantum-Atom Optics, Nonlinear Physics Centre, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, Australia
  • 3ARC Centre of Excellence for Quantum-Atom Optics, School of Physical Sciences, University of Queensland, Brisbane QLD 4072, Australia
  • 4Physics Department, University of Otago, P.O. Box 56, Dunedin, New Zealand

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Issue

Vol. 75, Iss. 4 — April 2007

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