Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Quantengase: Optische Gitter 3

Q 38.5: Talk

Thursday, March 15, 2012, 11:45–12:00, V53.01

Real-time exploration of fluctuations in a quantum gas with cavity-mediated long-range interactions — •Rafael Mottl, Kristian Baumann, Renate Landig, Ferdinand Brennecke, Tobias Donner, and Tilman Esslinger — Quantum Optics Group, ETH Zurich, Switzerland

We report on the study of increased fluctuations approaching a superfluid-supersolid phase transition driven by cavity-mediated long-range interactions. The openness of the cavity allows for time-resolved information about the density fluctuations. We measure increased fluctuations near the phase transition which is accompanied by a mode softening. Quantum fluctuations dominate a wide region below the phase transition. We reveal the subtle role of atomic and photonic dissipation on the steady state of this open quantum system.