Bogoliubov dynamics of condensate collisions using the positive-P representation

Details Bogoliubov dynamics of condensate collisions using the positive-P representation Bogoliubov dynamics of condensate collisions using the positive-P representation

2011-05-06

arxiv.org/abs/1105.1324v1

Phys. Rev. A 83, 063625 (2001)

Physics

Condensed Matter

Quantum Gases

9 pages. 5 figures

Scientific paper

We formulate the time-dependent Bogoliubov dynamics of colliding Bose-Einstein condensates in terms of a positive-P representation of the Bogoliubov field. We obtain stochastic evolution equations for the field which converge to the full Bogoliubov description as the number of realisations grows. The numerical effort grows linearly with the size of the computational lattice. We benchmark the efficiency and accuracy of our description against Wigner distribution and exact positive-P methods. We consider its regime of applicability, and show that it is the most efficient method in the common situation - when the total particle number in the system is insufficient for a truncated Wigner treatment.

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