Decoherence of Bose-Einstein condensates in traps at finite temperature
arXiv:cond-mat/9808336 · doi:10.1103/PhysRevLett.81.5262
Abstract
The phase diffusion of the order parameter of trapped Bose-Einstein condensates at temperatures large compared to the mean trap frequency is determined, which gives the fundamental limit of the line-width of an atom laser. In addition a prediction of the correlation time of the number fluctuations in the condensate is made and related to the phase diffusion via the fluctuation-dissipation relation.
4 pages Revtex, revised version, to appear in Phys. Rev. Letters