Dissipation induced coherence and stochastic resonance of an open two-mode Bose-Einstein condensate
Abstract
We discuss the dynamics of a Bose-Einstein condensate in a double-well trap subject to phase noise and particle loss. The phase coherence of a weakly-interacting condensate, experimentally measured via the contrast in an interference experiment, as well as the response to an external driving become maximal for a finite value of the dissipation rate matching the intrinsic time scales of the system. This can be understood as a stochastic resonance of the many-particle system. Even stronger effects are observed when dissipation acts in concurrence with strong inter-particle interactions, restoring the purity of the condensate almost completely and increasing the phase coherence significantly. Our theoretical results are backed by Monte Carlo simulations, which show a good qualitative agreement and provide a microscopic explanation for the observed stochastic resonance effect.
Keywords
Cite
@article{arxiv.0902.0611,
title = {Dissipation induced coherence and stochastic resonance of an open two-mode Bose-Einstein condensate},
author = {D. Witthaut and F. Trimborn and S. Wimberger},
journal= {arXiv preprint arXiv:0902.0611},
year = {2009}
}
Comments
12 pages, 12 figures