Continuous individual microwave photon superconducting detection with up to 70% efficiency

https://www.eurekalert.org/news-releases/1122038

"detection difficult since their energy 100,000X weaker than for visible light, overcome using tiny superconducting circuit changes its state moment absorbing microwave photon... single photon's heat triggers change without needing massive external amplification, no dead time for reset/ complex clearance steps after every detection, and accompanying noise... up to 70% efficient, still requires cryogenic temperatures for superconductivity... dark matter research, easily integrated into quantum computers"