Near-field Strong Coupling and Entanglement of Quantum Emitters for Room-temperature Quantum Technologies

TL;DR

This paper reviews recent advances in quantum nanophotonics, focusing on nanoplasmonic cavity quantum electrodynamics for room-temperature quantum technologies, including biosensing, ultrafast single-photon sources, and entanglement.

Contribution

It highlights innovative proposals and recent studies demonstrating strong coupling and entanglement at ambient temperatures using industry-grade plasmonic devices.

Findings

Nanoplasmonic systems enable room-temperature quantum operations.

Strong coupling facilitates ultrafast single-photon emission.

Near-field entanglement is achievable with nanoscale devices.

Abstract

In recent years, quantum nanophotonics has forged a rich nexus of nanotechnology with photonic quantum information processing, offering remarkable prospects for advancing quantum technologies beyond their current technical limits in terms of physical compactness, energy efficiency, operation speed, temperature robustness and scalability. In this perspective, we highlight a number of recent studies that reveal the especially compelling potential of nanoplasmonic cavity quantum electrodynamics for driving quantum technologies down to nanoscale spatial and ultrafast temporal regimes, whilst elevating them to ambient temperatures. Our perspective encompasses innovative proposals for quantum plasmonic biosensing, driving ultrafast single-photon emission and achieving near-field multipartite entanglement in the strong coupling regime, with a notable emphasis on the use of industry-grade devices. We conclude with an outlook emphasizing how the bespoke characteristics and functionalities of plasmonic devices are shaping contemporary research directives in ultrafast and room-temperature quantum nanotechnologies.