Quantum Photonic Circuits Integrated with Color Centers in Designer Nanodiamonds

TL;DR

This paper introduces a novel method for integrating diamond color centers with silicon nitride photonic circuits, enabling enhanced light-matter interaction and scalable quantum photonic device fabrication.

Contribution

A new deterministic assembly technique for embedding diamond color centers into silicon nitride circuits, improving coupling efficiency and reducing insertion loss.

Findings

Observation of Purcell enhancement in silicon vacancy centers

Successful hybrid integration with low insertion loss

Potential for scalable quantum photonic circuit manufacturing

Abstract

Diamond has emerged as a leading host material for solid-state quantum emitters, quantum memories, and quantum sensors. However, the challenges in fabricating photonic devices in diamond have limited its potential for use in quantum technologies. While various hybrid integration approaches have been developed for coupling diamond color centers with photonic devices defined in a heterogeneous material, these methods suffer from either large insertion loss at the material interface or evanescent light-matter coupling. Here, we present a new technique that enables deterministic assembly of diamond color centers in a silicon nitride photonic circuit. Using this technique, we observe Purcell enhancement of silicon vacancy centers coupled to a silicon nitride ring resonator. Our hybrid integration approach has the potential for achieving the maximum possible light-matter interaction strength while maintaining low insertion loss, and paves the way towards scalable manufacturing of large-scale quantum photonic circuits integrated with high-quality quantum emitters and spins.