Programmable Quantum Photonic Interfaces for Quantum Networking

Quantum networks require interfaces translating memory photons to telecom wavelengths while controlling spatial modes; tasks performed by separate components today. We present a programmable alternative: a structured pump writes a virtual Bragg grating enabling simultaneous spatio-spectral conversion and real-time controlling of emission. Using a LiNbO${}_3$ whispering-gallery resonator, we demonstrate 93% spatial coupling and bidirectional conversion between 736,nm and 1347,nm. This reconfigurable interface eliminates cascaded losses and hardware modifications.