Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 27: Quantengase: Optische Gitter 2

Q 27.8: Talk

Tuesday, March 13, 2012, 15:45–16:00, V53.01

Quantum dynamics at an unstable classical fixed point — •Wolfgang Müssel, Tilman Zibold, Helmut Strobel, Eike Nicklas, Jiří Tomkovič, Moritz Höfer, Ion Stroescu, David Hume, and Markus Oberthaler — Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany

We experimentally investigate quantum dynamics in a two component BEC of 87-Rubidium. The system is initially prepared in a coherent spin state centered on an unstable fixed point in the classical phase space of the Bosonic Josephson Junction.

For short evolution times, the interplay of linear coupling and nonlinear interaction between the particles generates squeezing of the Gaussian quantum state. For longer evolution times, the measured distributions of the population imbalance indicate a non-Gaussian character of the many particle state. The ability to perform simultaneous measurements on up to 40 BECs in an optical lattice yields sufficient statistics for tomographic reconstruction of the final state's Wigner distribution.