ALEXANDRIA, Va., June 10 -- United States Patent no. 12,292,669, issued on May 6, was assigned to Psiquantum Corp. (Palo Alto, Calif.).

"Coupled resonator photon-pair sources" was invented by Mihai Dorian Vidrighin (Palo Alto, Calif.), Damien Bonneau (Le Pradet, France), Alessandro Farsi (Mountain View, Calif.) and Mark G. Thompson (Palo Alto, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Techniques disclosed herein relate to photon sources with high spectral purity and high brightness. In one embodiment, a photon-pair source includes a pump waveguide, a first resonator coupled to the pump waveguide to couple pump photons from the pump waveguide into the first resonator, a second resonator coupled to...