  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.
