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Optically interfaced spins in the solid promise scalable quantum networks.Robust and reliable optical properties have so far been restricted to systemswith inversion symmetry. Here, we release this stringent constraint bydemonstrating outstanding optical and spin properties of single silicon vacancycentres in silicon carbide. Despite the lack of inversion symmetry, thesystem's particular wave function symmetry decouples its optical propertiesfrom magnetic and electric fields, as well as from local strain. This providesa high-fidelity spin-to-photon interface with exceptionally stable and narrowoptical transitions, low inhomogeneous broadening, and a large fraction ofresonantly emitted photons. Further, the weak spin-phonon coupling results inelectron spin coherence times comparable with nitrogen-vacancy centres indiamond. This allows us to demonstrate coherent hyperfine coupling to singlenuclear spins, which can be exploited as qubit memories. Our findings promisequantum network applications using integrated semiconductor-basedspin-to-photon interfaces.

High-fidelity spin and optical control of single silicon vacancy centres in silicon carbide