ALEXANDRIA, Va., June 19 -- United States Patent no. 12,335,378, issued on June 17, was assigned to British Telecommunications PLC (London).
"To quantum key distribution" was invented by Marco Menchetti (London).
According to the abstract* released by the U.S. Patent & Trademark Office: "There is herein disclosed a method of establishing at least a portion of an encryption key, the method including transmitting a first photon along a channel, determining the length of time the first photon takes to propagate along the channel, making a modification to the channel so as to change the length of time it takes a photon to propagate along the channel, transmitting a second photon along the modified channel, determining the length of time the s...