ALEXANDRIA, Va., Sept. 3 -- United States Patent no. 12,407,499, issued on Sept. 2, was assigned to TSINGHUA UNIVERSITY (Beijing).

"Secure relay-based quantum communication method and communication network" was invented by Guilu Long (Beijing) and Dong Pan (Beijing).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present application provides a secure repeater-based quantum communication method and communication network. Said method comprises a transmitter encrypting plaintext information to be sent, to obtain ciphertext; the transmitter sending the ciphertext to a repeater node by means of a quantum communication protocol, so as to send the ciphertext to a receiver by means of at least one repeater node; a...