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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster: Quantum Optics and Photonics II
Q 41.21: Poster
Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik
Development of a coherent spin photon interface for quantum repeaters using NV centers in diamond — •Maximilian Pallmann1, Julia Benedikter1,2, Evgenij Vasilenko1, and David Hunger1 — 1Karlsruher Institut für Technologie — 2Ludwig-Maximilians Universtität München
NV color centers in diamond can be a promising source of indistinguishable photons entangled to either the electron or nuclear spin of a single NV center. The weak (∼3%) branching ratio into the coherent zero-phonon line (ZPL) however strongly limits the efficiency of the spin-photon interface. To increase the efficiency as required for large distance quantum networks, the ZPL of the NV centers can be coupled to a optical microcavity and thereby strongly enhanced by the Purcell effect. We use a fiber-based microcavity, which combines a small mode volume (few λ3) with a high quality factor (∼106) and tunability. The NV centers are located in a diamond membrane (few-µm thickness) which is bonded onto a plane mirror. Depending on the surface roughness of the diamond membrane we expect to reach a Finesse > 104, leading to an extraction efficiency of ZPL photons of up to 80%.