Enhanced Spectral Density of a Single Germanium Vacancy Center in a Nanodiamond by Cavity-Integration

Abstract

Color centers in diamond, among them the negatively-charged germanium vacancy (GeV${}^{-}$), are promising candidates for many applications of quantum optics such as a quantum network. For efficient implementation, the optical transitions need to be coupled to a single optical mode. Here, we demonstrate the transfer of a nanodiamond containing a single ingrown GeV- center with excellent optical properties to an open Fabry-Pérot microcavity by nanomanipulation utilizing an atomic force microscope. Coupling of the GeV- defect to the cavity mode is achieved, while the optical resonator maintains a high finesse of F = 7,700 and a 48-fold spectral density enhancement is observed. This article demonstrates the integration of a GeV- defect with a Fabry-Pérot microcavity under ambient conditions with the potential to extend the experiments to cryogenic temperatures towards an efficient spin-photon platform.

arXiv comment6 pages, 3 figures. The article has been accepted by Applied Physics Letters. It is found at https://doi.org/10.1063/5.0156787. Added acknowledgment: S.S. acknowledges support of the Marie Curie ITN project LasIonDef (GA n.956387)

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