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QI: Fachverband Quanteninformation

QI 42: Quantum Technologies (Color Centers and Ion Traps) II (joint session Q/QI)

QI 42.6: Talk

Friday, March 14, 2025, 12:30–12:45, HS Botanik

Cavity-Enhanced Spin-Photon Interface for Single Tin-Vacancy Centers in Diamond — •Andras Lauko¹, Kerim Köster¹, Julia Heupel², Philipp Fuchs³, Michael Kieschnick⁴, Michael Förg⁵, Thomas Hümmer⁵, Cyril Popov², Jan Meijer⁴, Christoph Becher³, and David Hunger¹ — ¹Karlsruher Institut für Technologie — ²Universität Kassel — ³Universität des Saarlandes — ⁴Universität Leipzig — ⁵Qlibri GmbH

Building a long-distance quantum network is one of the big challenges in the field of quantum communication, which requires the development of a quantum repeater.

Tin-vacancy centers in diamond are a rising candidate among color centers in diamond, having higher operating temperatures than silicon-vacancy centers and less prone to phonon-coupling relative to nitrogen-vacancy centers.

In our experiment, we integrate a diamond membrane into an open access fiber-based Fabry-Perot microcavity to attain emission enhancement in a single well-collectable mode. We present our fully tunable, cryogenic cavity platform operating in a tabletop dilution cryostat, and we achieve a picometer mechanical stability. The platform also allows for integration of a superconducting DC magnet and microwave antenna for spin manipulation.

We observe cavity-enhanced fluorescence signal of single, shallow-implanted tin-vacancy centers in diamond, showing Purcell-enhancement and thus higher emission rates and reduced excited state lifetimes.

Keywords: SnV; diamond; cavity