Comment on ``Phase and Phase Diffusion of a Split Bose-Einstein Condensate''

Details Comment on ``Phase and Phase Diffusion of a Split Bose-Einstein Condensate'' Comment on ``Phase and Phase Diffusion of a Split Bose-Einstein Condensate''

1998-07-03

arxiv.org/abs/cond-mat/9807056v1

Physics

Condensed Matter

Superconductivity

2 pages, no figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.81.1344

Recently Javanainen and Wilkens [Phys. Rev. Lett. 78, 4675 (1997)] have analysed an experiment in which an interacting Bose condensate, after being allowed to form in a single potential well, is "cut" by splitting the well adiabatically with a very high potential barrier, and estimate the rate at which, following the cut, the two halves of the condensate lose the "memory" of their relative phase. We argue that, by neglecting the effect of interactions in the initial state before the separation, they have overestimated the rate of phase randomization by a numerical factor which grows with the interaction strength and with the slowness of the separation process.

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