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Q: Fachverband Quantenoptik und Photonik

Q 51: Quantengase: Gitter und Tunneln II

Q 51.1: Vortrag

Donnerstag, 5. März 2009, 16:30–16:45, Audi-A

Dissipation induced coherence and stochastic resonance of an open two-mode Bose-Einstein condensate — •Dirk Witthaut¹, Friederike Trimborn², and Sandro Wimberger³ — ¹QUANTOP, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark — ²Institut für mathematische Physik, TU Braunschweig, D-38106 Braunschweig, Germany — ³Institut für theoretische Physik, Universität Heidelberg, D-69120, Heidelberg, Germany

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 as well as the response to an external driving show a pronounced stochastic resonance effect: Both quantities become maximal for a finite value of the dissipation rate matching the intrinsic time scales of the 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.