Multi-qubit registers with solid-state defect centers

Medium-scale ensembles of qubits offer a platform for near-term quantum technologies, as well as studies of many-body physics. Atom-like emitters in solids have emerged as promising candidates for this application, with long coherence times, coherent optical transitions, the ability to couple to long-lived nuclear spins for extended storage, and a path towards scalability. A prerequisite for generating such clusters is subdiffraction localization, necessary to achieve strong spin-spin coupling for efficient state transfer and gates operations.

In this work, we present progress made towards producing such ensembles. We demonstrate subdiffraction registers of multiple nitrogen vacancy centers in diamond that maintain individual control and readout of each constituent spin. We further discuss recent work towards scalable creation of such clusters and techniques for producing systems of coupled spins.