Max Planck Institute for Dynamics and Self-Organization -- Department for Nonlinear Dynamics and Network Dynamics Group
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Sonderseminar

Thursday, 04.06.2009 11 s.t.

Quantum stochastic resonance in a lossy Bose-Einstein condensate

by Dirk Witthaut
from Niels Bohr Institute, University of Copenhagen

Contact person: Marc Timme

Location

Seminarraum Haus 1, EG

Abstract

In our naive understanding noise is generally distracting, hindering measurements and degrading coherences in quantum mechanics. A paradigmatic counterexample to this assertion is the effect of stochastic resonance, where the response of a system to an external driving assumes its maximum in the presence of an infinite amount of thermal noise, when the time scales of the noise and the driving match. In my talk I will give an introduction into the different mechanisms of stochastic resonance in classical and quantum physics. Then I will present some recent results on the dynamics of Bose-Einstein condensates in lossy optical lattices, where the right amount of dissipation can increase the spatial coherence as well as the purity of the condensate.

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