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Coherent exchange of single photons is at the heart of applied QuantumOptics. The negatively-charged silicon vacancy center in diamond is among mostpromising sources for coherent single photons. Its large Debye-Waller factor,short lifetime and extraordinary spectral stability is unique in the field ofsolid-state single photon sources. However, the excitation and detection ofindividual centers requires high numerical aperture optics which, combined withthe need for cryogenic temperatures, puts technical overhead on experimentalrealizations. Here, we investigate a hybrid quantum photonics platform based onsilicon-vacancy center in nanodiamonds and metallic bullseye antenna to realizea coherent single-photon interface that operates efficiently down to lownumerical aperture optics with an inherent resistance to misalignment.

A Robust Coherent Single-Photon Interface for Moderate- NA Optics Based on SiV Center in Nanodiamonds and a Plasmonic Bullseye Antenna