Nanophotonic Quantum Networks in Diamond
Efficient interfaces between photons and quantum emitters form the basis for quantum networks and enable optical nonlinearities at the single-photon level. I will discuss recent experiments where silicon-vacancy (SiV) color centers are coupled to one dimensional diamond nanophotonic devices to achieve strong light-matter interactions. 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.
 A. Sipahigil et al., http://arxiv.org/abs/1608.05147 (2016).