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Q: Fachverband Quantenoptik und Photonik

Q 48: Poster – Quantum Optics, Technologies, and Optomechanics

Q 48.5: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

Experiments towards strong coupling in an atom-optomechanical hybrid system — •Felix Klein¹, Jakob Butlewski¹, Alexander Schwarz², Klaus Sengstock¹, Roland Wiesendanger², 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

The advancement of modern quantum physics has catalyzed the development of hybrid quantum systems, which combine distinct quantum platforms to leverage their individual strengths. We present our latest results on achieving strong hybrid coupling between a micromechanical Si₃ N₄ trampoline resonator and laser-cooled ⁸⁷Rb atoms. This coupling is mediated via a coherent light field, which reflects off the resonator to form an optical 1D lattice potential for the atoms. The optical losses along the beam path create an asymmetrically pumped lattice, inducing atomic density waves that destabilize the coupling for attractive lattice potentials. Implementing a compensation lattice allowed access to the attractive coupling regime, achieving a maximal cooperativity of C_hybrid = 100 ± 25 at room temperature. Additionally, we incorporated a new high-finesse fiber cavity (F = 785), significantly enhancing the coupling strength and achieving C_hybrid = 5900 ± 1300 at room temperature. Further increasing the cavity finesse to F= 14500 did not yield improvements in coupling strength, aligning with theoretical predictions.

Keywords: Hybrid Quantum Systems; Cavity Optomechanics; Ultracold Atoms