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Bonn 2025 – scientific programme

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QI: Fachverband Quanteninformation

QI 18: Quantum Networks, Repeaters, and QKD III (joint session Q/QI)

QI 18.1: Talk

Wednesday, March 12, 2025, 11:00–11:15, AP-HS

Diamond Membrane with strained SiV color centers coupled to a fabry perot microcavity — •Florian Feuchtmayr1, Robert Berghaus1, Selene Sachero1, Gregor Bayer1, Julia Heupel2, Tobias Herzig3, Jan Meijer3, Cyril Popov2, and Alexander Kubanek11Institut für Quantenoptik Universitat Ulm — 2Institute of Nanostructure Technologies and Analytics, Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel — 3Division of Applied Quantum Systems, Felix Bloch Institute for Solid State Physics, University Leipzig

Group IV color centers in diamond, such as silicon vacancy (SiV), are promising for quantum optics because of their optical transitions, spin access, and good coherence properties. SiV centers typically require millikelvin temperatures, but increasing the ground state splitting improves coherence, allowing operation at higher temperatures. Here, we demonstrate the integration of a single-crystal diamond membrane into a high-finesse microcavity (F = 3000), achieving significant lifetime shortening with a Purcell factor of 2.2 in a liquid helium atmosphere. Absorption and strain spectroscopy confirm enhanced ground-state splitting, paving the way for a spin-photon interface.

Keywords: Single Photons; Color Centers; Quantum Networks; Strain; Cavity

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