A hybrid spin-optomechanical platform in diamond for generating controlled spin-spin interactions

Strongly-interacting ensembles of solid state spins have the potential to make substantial impacts in quantum sensing, quantum information science, and in the study of many-body interacting systems. However, engineering such a platform remains a challenge due to the weakness and distance dependence of the native magnetic dipole-dipole interactions. One alternative approach to generating spin-spin interactions is to use an intermediary quantum system. A promising candidate for this role is a mechanical resonator, which maintains long phonon lifetimes while coupling to a wide range of quantum systems including solid state spins. The interaction rates for silicon vacancy (SiV) center spins embedded in diamond optomechanical crystals (OMCs) are predicted to exceed 1 MHz. We fabricate diamond OMCs with mechanical quality factors as high as 1.9 million and find that their optical and mechanical properties make them a platform well-suited to hosting both quantum optomechanics experiments and high-cooperativity spin-phonon interactions with SiV centers.