Photon-mediated interactions between quantum emitters in a diamond nanocavity

TL;DR

This paper demonstrates photon-mediated interactions between silicon-vacancy color centers in a diamond nanocavity, enabling coherent control of quantum states for scalable quantum networks.

Contribution

It shows strong coupling of SiV centers to a diamond nanocavity and control of their interactions via optical resonance and spin degrees of freedom.

Findings

Observation of spectrally-resolved superradiant and subradiant states

Control of interactions using SiV electronic spins

Potential for cavity-mediated quantum gates

Abstract

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.