Hannover 2020 – scientific programme
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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 Becker1 — 1Center 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.