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Bulletin of the American Physical Society

Single-Photon Switching and Entanglement of Solid-State Qubits in an Integrated Nanophotonic System

Ruffin E. Evans, Alp Sipahigil, Денис Дмитриевич Сукачев, Michael J. Burek, Johannes Borregaard, Mihir K. Bhaskar, Christian N. Nguyen, Jose L Pacheco, Edward S. Bielejec, Marko Lončar, Mikhail D. Lukin

Published Jun 8, 2017• 3 citations
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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.