An integrated diamond nanophotonics platform for quantum optical networks.
Research paper by
A A Sipahigil, R E RE Evans, D D DD Sukachev, M J MJ Burek, J J Borregaard, M K MK Bhaskar, C T CT Nguyen, J L JL Pacheco, H A HA Atikian, C C Meuwly, R M RM Camacho, F F Jelezko, E E Bielejec, H H Park, M M Lončar, M D MD Lukin
Efficient interfaces between photons and quantum emitters form the basis for quantum networks and enable optical nonlinearities at the single-photon level. We demonstrate an integrated platform for scalable quantum nanophotonics based on silicon-vacancy (SiV) color centers coupled to diamond nanodevices. By placing SiV centers inside diamond photonic crystal cavities, we realize a quantum-optical switch controlled by a single color center. We control the switch using SiV metastable states and observe optical switching at the single-photon level. Raman transitions are used to realize a single-photon source with a tunable frequency and bandwidth in a diamond waveguide. By measuring intensity correlations of indistinguishable Raman photons emitted into a single waveguide, we observe a quantum interference effect resulting from the superradiant emission of two entangled SiV centers.