Dynamical quantum noise in trapped Bose-Einstein condensates

M. J. Steel*, M. K. Olsen, L. I. Plimak, P. D. Drummond, S. M. Tan, M. J. Collett, D. F. Walls, R. Graham

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

317 Citations (Scopus)

Abstract

We introduce the study of dynamical quantum noise in Bose-Einstein condensates through numerical simulation of stochastic partial differential equations obtained using phase-space representations. We derive evolution equations for a single trapped condensate in both the positive-P and Wigner representations and perform simulations to compare the predictions of the two methods. The positive-P approach is found to be highly susceptible to the stability problems that have been observed in other strongly nonlinear, weakly damped systems. Using the Wigner representation, we examine the evolution of several quantities of interest using from a variety of choices of initial state for the condensate and compare results to those for single-mode models.

Original languageEnglish
Pages (from-to)4824-4835
Number of pages12
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume58
Issue number6
Publication statusPublished - Dec 1998

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