Broadband Spatio-Spectral Mode Conversion via Four-Wave Mixing

TL;DR

This paper presents a broadband, scalable four-wave mixing method in ring resonators that simplifies quantum network coupling and bridges visible and infrared spectra for quantum communication.

Contribution

It introduces a novel framework for broadband phase-matched four-wave mixing in ring resonators, enabling efficient spatio-spectral conversion and scalable quantum network integration.

Findings

165 nm bandwidth for efficient conversion

Proposed diamond-on-insulator fabrication pathway

Framework for analyzing single-photon coupling efficiency

Abstract

We introduce a framework for scalable and broadband free-space phase-matched four-wave mixing in ring resonators. This method for four-wave mixing reduces the complexity of coupling an emitter to a quantum network by combining the spatial and spectral interfaces between them into one nonlinear optical process. The device is compliant with current heterogeneous integration capabilities and has a bandwidth of 165 nm for efficient spatio-spectral conversion. We outline a fabrication-ready diamond-on-insulator pathway towards modular unit cells that natively bridge visible color centers to the infrared spectrum for scalable quantum networks. We also present and analyze an end-to-end framework for considering single-photon coupling efficiency from a color center to a quantum network. This framework represents a step forwards in analyzing and reducing system-scale losses in a spin-photon interface.