Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 62: Optomechanics
Q 62.4: Talk
Friday, March 15, 2019, 11:30–11:45, S SR 111 Maschb.
Towards coherent dynamics in an atomic-mechanical quantum hybrid experiment — •Tobias Wagner1, Jakob Butlewski1, Philipp Rohse1, Clara Schellong1, 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
Quantum hybrid systems have recently attracted considerable interest due to their prospects of combining the benefits of several very different quantum systems. Technological applications range from quantum computation and quantum communication to quantum enhanced sensing. We have realized a specific quantum hybrid experiment to optically couple ultracold atoms to a cryogenically cooled membrane oscillator inside a fiber Fabry-Perot cavity. In our first experiments we have characterized in detail the coupling of the mechanical oscillator to the atoms by means of dissipative sympathetic cooling. Here, we present work towards coherent dynamics in the quantum hybrid system. Specifically, we improved our optomechanical system with an ultra-high-Q mechanical oscillator to allow ground-state cooling by means of active feedback control. For state preparation on the atomic side we perform microsecond pulsed lattice loading for non-adiabatic transfer of a Bose-Einstein condensate into the ground-state of our optical coupling lattice beam. This work is supported by the DFG via grants of Wi1277/29-1, BE 4793/2-1, SE 717/9-1 and by the CUI.