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Q: Fachverband Quantenoptik und Photonik
Q 40: Quantengase (Bosonen I)
Q 40.1: Talk
Thursday, March 13, 2008, 14:00–14:15, 1A
Differences between mean-field dynamics and N-particle quantum dynamics as a signature of entanglement — Christoph Weiss1,3 and •Niklas Teichmann2,3 — 1Laboratoire Kastler Brossel, École Normale Supérieure, Université Pierre et Marie-Curie-Paris 6, CNRS, Paris, France — 2Institut Henri Poincaré, Centre Emile Borel, Paris, France — 3Institut für Physik, Carl von Ossietzky Universität, Oldenburg, Germany
A Bose-Einstein condensate in a tilted double-well potential under the influence of time-periodic potential differences is investigated in the regime where the mean-field (Gross-Pitaevskii) dynamics become chaotic. For some parameters near stable regions, even averaging over several condensate oscillations does not remove the differences between mean-field and N-particle results. While introducing decoherence via piecewise deterministic processes reduces those differences, they are due to the emergence of mesoscopic entangled states in the chaotic regime.