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Quantum key distribution enables secure communication based on the principlesof quantum mechanics. The distance in fiber-based quantum communication islimited to about a hundred kilometers due to signal attenuation. Thus, quantumrepeaters are required to establish large-scale quantum networks. Ideal quantumrepeater nodes possess a quantum memory which is efficiently connected tophotons, the carrier of quantum information. Color centers in diamond and, inparticular, the negatively-charged silicon-vacancy centers are promisingcandidates to establish such nodes. The major obstacle is an inefficientconnection between the color centers spin to the Gaussian optics of fibernetworks. Here, we present an efficient spin-photon interface. Individualsilicon-vacancy centers coupled to the mode of a hemispherical Fabry-P\'erotmicrocavity show Purcell-factors larger than 1 when operated in a bath ofliquid Helium. We demonstrate coherent optical driving with a Rabi frequency of$290\,\mathrm{MHz}$ and all-optical access to the electron spin in strongmagnetic fields of up to $3.2\,\mathrm{T}$. Spin initialization within$67\,\mathrm{ns}$ with a fidelity of $80\,\%$ and a lifetime of$350\,\mathrm{ns}$ are reached inside the cavity. The spin-photon interface ispassively stable, enabled by placing a color center containing nanodiamond inthe hemispherical Fabry-P\'erot mirror structure and by choosing short cavitylengths. Therefore, our demonstration opens the way to realize quantum repeaterapplications.

A Quantum Repeater Platform based on Single SiV$^-$ Centers in Diamond with Cavity-Assisted, All-Optical Spin Access and Fast Coherent Driving