Two-node Quantum Network using Silicon-Vacancy Centers in a Diamond Nanophotonic Cavity

Silicon-vacancy (SiV) centers integrated into diamond nanophotonic crystal cavities provide efficient spin-photon interfaces and constitute a promising platform for quantum networking. Recently, spin-photon gates, memory-enhanced quantum communication, efficient single-photon generation, and high-fidelity gates between the SiV electron and the auxiliary 29Si nuclear spin have been demonstrated, all using a single quantum network node. In this work, we report on experimental realization of a quantum link connecting two SiV-based quantum nodes spatially separated by 20 meters. Using this system we realize optically mediated entanglement between 2 remote SiVs, observing the Bell-pair entanglement fidelity exceeding 0.74. Ongoing efforts towards extending these techniques to enable long-distance quantum communication will be discussed.