Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster: Quantum Optics and Photonics III
Q 42.43: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
Coupling cold atoms to a cryogenically cooled optomechanical device — •Tobias Wagner1, Christina Staarmann1, Philipp Christoph1, Ortwin Hellmig1, Andreas Bick1, Klaus Sengstock1, Hai Zhong2, Alexander Schwarz2, and Roland Wiesendanger2 — 1Center for Optical Quantum Technologies, Hamburg, Germany — 2Insitute for Applied Physics, Hamburg, Germany
We present work towards a new hybrid quantum system consisting of a sample of cold atoms coupled to a cryogenically precooled mechanical oscillator. Our ultimate goal is the investigation of two very different macroscopically large quantum systems coherently coupled to each other. For this purpose we have set up a Rubidium-BEC apparatus coupled to a SiN membrane placed inside a fiber Fabry Perot cavity via an optical lattice. This membrane in the middle system is cooled to below 500mK in a dilution refrigerator. We present details on the coupling laser system including a Pound Drever Hall lock of the fiber Fabry Perot cavity, a highly sensitive homodyne detection setup for the membrane motion and a coupling lattice. In order to tune the parameters of the coupling lattice the frequency of the coupling laser is locked to atomic resonance with an adjustable offset via a transfer lock. The homodyne detection is able to detect thermal membrane motion at cryogenic temperatures and we present first results regarding further feedback cooling of the membrane.
This work is supported by the DFG grants no. BE 4793/2-1 and SE 717/9-1.