Scalable On-Chip Single-Photon Cross-Bar Switching

Single-photon measurements of an electro-optic silicon-photonic add-drop microresonator demonstrate entanglement-preserving voltage-driven switching with fast 10%-90% transition times [<50 ps], low-loss transmission [94% (90%) bar (cross)-state] and high quantum two-photon interference visibility [~99%] at 1550 nm.