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Phonons are envisioned as coherent intermediaries between different types ofquantum systems. Engineered nanoscale devices such as optomechanical crystals(OMCs) provide a platform to utilize phonons as quantum information carriers.Here we demonstrate OMCs in diamond designed for strong interactions betweenphonons and a silicon vacancy (SiV) spin. Using optical measurements atmillikelvin temperatures, we measure a linewidth of 13 kHz (Q-factor of~440,000) for 6 GHz acoustic modes, a record for diamond in the GHz frequencyrange and within an order of magnitude of state-of-the-art linewidths for OMCsin silicon. We investigate SiV optical and spin properties in these devices andoutline a path towards a coherent spin-phonon interface.

High Q-factor diamond optomechanical resonators with silicon vacancy centers at millikelvin temperatures