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Q: Fachverband Quantenoptik und Photonik

Q 7: Ultracold atoms and BEC - I (with A)

Q 7.6: Talk

Monday, March 6, 2017, 16:00–16:15, N 1

Purity oscillations in coupled Bose-Einstein condensates — •Jonathan Stysch, Holger Cartarius, and Günter Wunner — 1. Institut für Theoretische Physik, Universität Stuttgart, 70550 Stuttgart, Germany

We investigate the many-body dynamics of two three-mode Bose-Einstein condensates (BECs) forming a six-mode system. Both three-mode subsystems are initially prepared as isolated, fully coherent BECs and are then rendered open systems by coupling them together. The dynamics induced by this coupling leads to a periodic loss and restoration of the coherence in each subsystem which is quantified by the purity of the single-particle density matrices of the respective subsystems. We show that these purity oscillations correspond with oscillations in the average contrast in interference experiments and are therefore linked to a quantity accessible in experiment.