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Bulletin of the American Physical Society

Coherent generation of single photons using a single silicon-vacancy color-center in a diamond nanophotonic cavity

Can M. Knaut, Daniel Assumpção, Rivka Bekenstein, Mihir K. Bhaskar, Erik Knall, Bartholomeus Machielse, Wenjie Gong, David Levonian, Pieter-Jan Stas, Yan Qi Huan, Ralf Riedinger, Hongkun Park, Marko Lončar, Mikhail D. Lukin

Published Jun 3, 2021• 0 citations
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arXiv:1608.05147•Science•Oct 14, 2016•844 citations
Chapter 1 reviews recent advances towards the realization of quantum networks based on atom-like solid-state quantum emitters coupled to nanophotonic devices. Specifically, focus is on experiments involving the negatively charged silicon-vacancy color center in diamond. These emitters combine homogeneous, coherent optical transitions and a long-lived electronic spin quantum memory. Optical and spin properties of this system at cryogenic temperatures and experiments where silicon-vacancy centers are coupled to nanophotonic cavities are discussed. Finally, the chapter discusses experiments demonstrating quantum nonlinearities at the single-photon level and two-emitter entanglement in a single nanophotonic device.
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.