Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 41: Poster: Quantum Optics and Photonics II

Q 41.21: Poster

Mittwoch, 13. März 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 Benedikter^1,2, 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%.