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QI: Fachverband Quanteninformation

QI 23: Poster II (joint session QI/Q)

QI 23.46: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

Cavity-enhanced fluorescence of ensemble NV centers — •Kerim Köster¹, Maximilian Pallmann¹, Rainer Stöhr², Julia Heupel³, Cyril Popov³, and David Hunger¹ — ¹Physikalisches Institut, Karlsruher Institute für Technologie (KIT) — ²3. Physikalisches Institut, University of Stuttgart — ³Institute of Nanostructure Technologies and Analytics (INA), Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel

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. A crucial component of this device is an efficient, coherent spin-photon interface. Coupling color centers in diamond to a microcavity is a promising approach therefore.

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 observe cavity-enhanced fluorescence spectra of an ensemble of shallow-implanted nitrogen vacancy centers in diamond and report a significant Purcell-enhancement of the zero-phonon line (ZPL). Furthermore, the emission yields temporal bunching of ZPL photons, which indicates a collective behavior in the emission process that can be attributed to superfluorescence.