Waveguide-integrated single-crystalline GaP resonators on diamond

TL;DR

This paper reports the fabrication of GaP resonator-waveguide structures on diamond, demonstrating their potential for efficient photon collection from NV centers, advancing scalable quantum entanglement in hybrid platforms.

Contribution

It introduces the integration of single-crystalline GaP resonators on diamond for quantum photonics, enabling scalable NV center entanglement and on-chip photon management.

Findings

GaP resonators coupled with waveguides achieve Q factor of 3,800

Demonstrated potential for efficient photon collection from NV centers

Pathway for scalable quantum entanglement in hybrid platforms

Abstract

Large-scale entanglement of nitrogen-vacancy (NV) centers in diamond will require integration of NV centers with optical networks. Toward this goal, we present the fabrication of single-crystalline gallium phosphide (GaP) resonator-waveguide coupled structures on diamond. We demonstrate coupling between 1 {\mu}m diameter GaP disk resonators and waveguides with a loaded Q factor of 3,800, and evaluate their potential for efficient photon collection if integrated with single photon emitters. This work opens a path toward scalable NV entanglement in the hybrid GaP/diamond platform, with the potential to integrate on-chip photon collection, switching, and detection for applications in quantum information processing.