Photon-mediated interactions between quantum emitters in a diamond nanocavity

Ruffin E. Evans, Mihir K. Bhaskar, Denis D. Sukachev, Christian T. Nguyen, Alp Sipahigil, Michael J. Burek, Bartholomeus Machielse, Grace H. Zhang, Alexander S. Zibrov, Edward Bielejec, Hongkun Park, Marko Lončar, Mikhail D. Lukin

Published 2018-07-11Version 1

Photon-mediated interactions between quantum systems are essential for realizing quantum networks and scalable quantum information processing. We demonstrate such interactions between pairs of silicon-vacancy (SiV) color centers strongly coupled to a diamond nanophotonic cavity. When the optical transitions of the two color centers are tuned into resonance, the coupling to the common cavity mode results in a coherent interaction between them, leading to spectrally-resolved superradiant and subradiant states. We use the electronic spin degrees of freedom of the SiV centers to control these optically-mediated interactions. Our experiments pave the way for implementation of cavity-mediated quantum gates between spin qubits and for realization of scalable quantum network nodes.