Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 4: Poster: Quantum Information

QI 4.16: Poster

Montag, 5. September 2022, 18:00–20:00, P2

Efficient spin-photon interface for NV centers in diamond — •Jeremias Resch1, Kerim Köster1, Maximillian Pallmann1, Julia Heupel2, Cyril Popov2, and David Hunger11Karlsruher Institut für Technologie (KIT) — 2Universität Kassel

In order to achieve spin-photon-based quantum computers, we require excellent control of the qubit spin states, in addition to long coherence times of the nuclear spin states. By combining several computing nodes, and linking them to a global register via optical networks, scalability is achieved. A crucial component of this optical network is an efficient, coherent single-photon source. Coupling colour centers in diamond, such as the nitrogen-vacancy or tin-vacancy centers, to a microcavity is a promising approach in order to achieve efficient single-photon sources. In our experiment, we integrate a diamond membrane into an open access fiber-based Fabry-Perot microcavity to attain emission enhancement into a single well-defined mode. We present our fully tunable, cryogenic cavity platform operating in a closed-cycle cryostat, and we achieve a sub-picometer mechanical stability during quiet periods. We observe cavity-enhanced fluorescence spectra of an ensemble of shallow-implanted nitrogen-vacancy centers in diamond, showing Purcell-enhancement of the zero-phonon line.

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