Programmable Quantum Photonic Interfaces for Quantum Networking

TL;DR

This paper introduces a programmable quantum photonic interface that enables efficient, reconfigurable conversion between different wavelengths and spatial modes, simplifying quantum network components and reducing losses.

Contribution

The authors develop a structured pump method in a LiNbO₃ resonator for simultaneous, real-time spatio-spectral conversion, offering a versatile alternative to multiple separate components.

Findings

93% spatial coupling efficiency achieved

Bidirectional conversion demonstrated between 736 nm and 1347 nm

Reconfigurable interface reduces cascaded losses

Abstract

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.