Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Optomechanics II
Q 30.6: Talk
Tuesday, March 6, 2018, 15:15–15:30, K 0.023
Combined sympathetic and feedback cooling in an atom-optomechanical hybrid system — •Tobias Wagner1, Philipp Christoph1, Felix Klein1, Hai Zhong2, Alexander Schwarz2, Roland Wiesendanger2, Klaus Sengstock1, and Christoph Becker1 — 1ZOQ-Center for Optical Quantum Technologies, Luruper Chaussee 149, 22761 Hamburg — 2Institute of Applied Physics, University of Hamburg, Jungiusstraße 9-11, 20355 Hamburg
We present our latest efforts towards realization of a hybrid quantum system consisting of a quantum gas of bosonic atoms (e.g., a Bose-Einstein condensate) optically coupled to a cryogenically precooled mechanical oscillator operated at T ≈ 500 mK. We routinely cool a high-stress Si3 N4 membrane to mean phonon occupancy of ⟨ n ⟩ ≈ 16 using combined quantum optical cooling schemes, i.e., sympathetic cooling with a laser cooled ensemble of atoms and active feedback cooling.
In this talk we will report in detail on the characterization and optimization of the combined cooling technique. We discuss possible improvements, which should allow us to cool the membrane further down into the ground state and open the door to investigate e.g. entanglement between membrane and BEC in this promising hybrid system. This work is supported by the DFG via grants of Wi1277/29-1, BE 4793/2-1 and SE 717/9-1.