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Robust spin-photon interfaces in solids are essential components in quantumnetworking and sensing technologies. Ideally, these interfaces combine along-lived spin memory, coherent optical transitions, fast and high-fidelityspin manipulation, and straightforward device integration and scaling. Thetin-vacancy center (SnV) in diamond is a promising spin-photon interface withdesirable optical and spin properties at 1.7 K. However, the SnV spin lacksefficient microwave control and its spin coherence degrades with highertemperature. In this work, we introduce a new platform that overcomes thesechallenges - SnV centers in uniformly strained thin diamond membranes. Thecontrolled generation of crystal strain introduces orbital mixing that allowsmicrowave control of the spin state with 99.36(9) % gate fidelity and spincoherence protection beyond a millisecond. Moreover, the presence of crystalstrain suppresses temperature dependent dephasing processes, leading to aconsiderable improvement of the coherence time up to 223(10) ${\mu}$s at 4 K, awidely accessible temperature in common cryogenic systems. Critically, thecoherence of optical transitions is unaffected by the elevated temperature,exhibiting nearly lifetime-limited optical linewidths. Combined with thecompatibility of diamond membranes with device integration, the demonstratedplatform is an ideal spin-photon interface for future quantum technologies.

Microwave-based quantum control and coherence protection of tin-vacancy spin qubits in a strain-tuned diamond membrane heterostructure