Quantum emitters in two dimensions

Two-dimensional materials offer potential for developing integrated quantum technologies Integrated circuits that process information encoded in individual quantized states of the electromagnetic field are poised to revolutionize information processing, communications, and sensing technologies. An emerging class of such quantum technologies is based on solid-state, on-demand single-photon emitters (SPEs) coupled to optical resonators and waveguides that serve as building blocks for high-density, on-chip quantum circuits ( 1 ). To date, the most investigated solid-state SPE systems are epitaxial quantum dots (QDs) that operate primarily at cryogenic temperatures, and color centers in solids. A noteworthy example of the latter is the nitrogen vacancy defect (NV-center) in diamond, which has become a standard for the myriad quantum optics experiments and inspired numerous studies of SPEs ( 2 ).