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Hybrid quantum photonic systems connect classical photonics to the quantumworld and promise to deliver efficient light-matter quantum interfaces whileleveraging the advantages of both, the classical and the quantum, subsystems.However, combining efficient, scalable photonics and solid state quantumsystems with desirable optical and spin properties remains a formidablechallenge. In particular the access to individual spin states and coherentmapping to photons remains unsolved for these systems. In this letter, wedemonstrate all-optical initialization and readout of the electronic spin of anegatively-charged silicon-vacancy center in a nanodiamond coupled to a siliconnitride photonic crystal cavity. We characterize relevant parameters of thecoupled emitter-cavity system and determine the silicon-vacancy center'sspin-relaxation and spin-decoherence rate. Our results mark an important steptowards the realization of a hybrid spin-photon interface based on siliconnitride photonics and the silicon-vacancy center's electron spin innanodiamonds with potential use for quantum networks, quantum communication anddistributed quantum computation.

All-Optical Spin Initialization via a Cavity Broadened Optical Transition in On-Chip Hybrid Quantum Photonics