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Hannover 2020 – scientific programme

The DPG Spring Meeting in Hannover had to be cancelled! Read more ...

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Q: Fachverband Quantenoptik und Photonik

Q 39: Posters: Quantum Optics and Photonics III

Q 39.33: Poster

Wednesday, March 11, 2020, 16:30–18:30, Empore Lichthof

Approaching the motional ground state of a cold nanomechanical oscillator in a hybrid atom-optomechanical system — •Jakob Butlewski1, Tobias Wagner1, Philipp Rohse1, Cody Friesen2, Felix Klein1, Roland Wiesendanger2, Klaus Sengstock1, Alexander Schwarz2, and Christoph Becker11Center for Optical Quantum Technologies, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2Institute for Nanostructure and Solid State Physics, University of Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany

Hybrid quantum systems pose a promising testbed for quantum theory and may further facilitate the implementation of quantum computation and communication protocols. In our pursuit to realize such a hybrid quantum system we have set up a dedicated experiment to couple ultracold 87Rb atoms to a cryogenic nanomechanical oscillator inside a fiber-cavity. In order to approach the motional ground state of the oscillator we apply active feedback cooling, which is based on a continuous position measurement performed by homodyne detection. Here we report on our progress in cooling the oscillator close to the ground state with a final phonon occupancy of ⟨ n ⟩=3.8. Furthermore we discuss possible limitations for the lowest achievable temperature in our system as well as solutions to overcome these.

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