Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 40: Optomechanics and Photonics
Q 40.4: Poster
Wednesday, March 16, 2022, 16:30–18:30, P
Pump asymmetry compensation in a quantum hybrid system — •Christian Felix Klein1, Jakob Butlewski1, Klaus Sengstock1, Roland Wiesendanger2, Alexander Schwarz2, and Christoph Becker1 — 1Center for Optical Quantum Technologies, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2Institute for Applied Physics, University of Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany
Hybrid Quantum Systems combine advantages of different quantum systems and are promising candidates for future quantum information and technology applications. In our experiment, we create a hybrid system through light-mediated, long-distance coupling of motional degrees of freedom of cold atoms in an optical lattice to the fundamental mode of a cryogenically cooled micromechanical trampoline oscillator inside a Fiber Fabry Pérot Cavity (FFPC).
Owing to inevitable losses between the two systems this coupling is intrinsically asymmetric which delays the backaction of the atoms on the mechanical resonator. For large atomic densities and lattice light detuned to the red side of the atomic resonance, this delay turns negative into positive feedback and drives the system resonantly into limit cycle oscillations. This effect limits the number of atoms that can contribute to the coupling strength Chybrid ∝ Natoms and diminishes i.e. feedback cooling performance.
Here we suggest a new approach to compensate this asymmetry with an additional auxiliary lattice beam and present detailed characterization measurements.