Dynamical quantum noise in Bose-Einstein condensates

Details Dynamical quantum noise in Bose-Einstein condensates Dynamical quantum noise in Bose-Einstein condensates

1998-07-27

arxiv.org/abs/cond-mat/9807349v1

Physics

Condensed Matter

Soft Condensed Matter

8 figures, submitted to Phys. Rev. A

Scientific paper

10.1103/PhysRevA.58.4824

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.

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