Scalable fabrication of coupled NV center - photonic crystal cavity systems by self-aligned N ion implantation
A major milestone is achieved towards the realization of diamond quantum computing. The main challenge in developing scalable architectures to interface between spins and photons is achieving controlled coupling between a nitrogen vacancy (NV) defect and an optical resonator. Now, T. Schröder, D. Englund, et al. report on an innovative approach to achieve scalable coupled NV-cavity systems. The technique relies on a self-assigned lithography process that enables simultaneous patterning and precise implantation with one mask. Therefore, spatially deterministic alignment of the implantation species (i.e., nitrogen) into the cavity hot field becomes feasible. Using this method, coupling of the NV zero phonon lines to the cavity modes is realized with five-fold enhancement and up to 90-fold enhancement of the phonon side band. This promising approach will serve as a stepping stone towards integrated diamond photonics, with the next steps of scalable integration and individual cavity tuning not far behind.