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

Understand

Efficient interfaces between photons and quantum emitters form the basis for quantum networks and enable nonlinear optical devices operating at the single-photon level.

• We demonstrate an integrated platform for scalable quantum nanophotonics based on silicon-vacancy (SiV) color centers coupled to nanoscale diamond devices.
• 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 orbital states and verify optical switching at the single-photon level by using photon correlation measurements.