Diamond Integrated Quantum Photonics: A Review

TL;DR

This review discusses recent advances in integrated diamond quantum photonics, highlighting developments in spin-photon interfaces, cavity optomechanics, and spin-phonon transduction, and explores future prospects and challenges for scalable quantum technologies.

Contribution

It provides a comprehensive overview of recent progress in creating integrated diamond quantum photonic devices and discusses future directions and remaining challenges.

Findings

Diamond spin qubits enable remote entanglement and quantum communication.

Recent nanofabrication techniques facilitate scaling of diamond quantum devices.

Diamond's properties make it a leading platform for quantum information processing.

Abstract

Integrated quantum photonics devices in diamond have tremendous potential for many quantum applications, including long-distance quantum communication, quantum information processing, and quantum sensing. These devices benefit from diamond's combination of exceptional thermal, optical, and mechanical properties. Its wide electronic bandgap makes diamond an ideal host for a variety of optical active spin qubits that are key building blocks for quantum technologies. In landmark experiments, diamond spin qubits have enabled demonstrations of remote entanglement, memory-enhanced quantum communication, and multi-qubit spin registers with fault-tolerant quantum error correction, leading to the realization of multinode quantum networks. These advancements put diamond at the forefront of solid-state material platforms for quantum information processing. Recent developments in diamond nanofabrication techniques provide a promising route to further scaling of these landmark experiments towards real-life quantum technologies. In this paper, we focus on the recent progress in creating integrated diamond quantum photonic devices, with particular emphasis on spin-photon interfaces, cavity optomechanical devices, and spin-phonon transduction. Finally, we discuss prospects and remaining challenges for the use of diamond in scalable quantum technologies.