US 12,407,499 B2
Secure relay-based quantum communication method and communication network
Guilu Long, Beijing (CN); and Dong Pan, Beijing (CN)
Assigned to TSINGHUA UNIVERSITY, Beijing (CN)
Appl. No. 18/259,072
Filed by TSINGHUA UNIVERSITY, Beijing (CN)
PCT Filed Jul. 28, 2021, PCT No. PCT/CN2021/108903
§ 371(c)(1), (2) Date Jun. 22, 2023,
PCT Pub. No. WO2022/142307, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 202011629573.2 (CN), filed on Dec. 31, 2020.
Prior Publication US 2024/0048371 A1, Feb. 8, 2024
Int. Cl. H04L 9/08 (2006.01); H04B 10/079 (2013.01); H04B 10/29 (2013.01); H04L 9/06 (2006.01)
CPC H04L 9/0855 (2013.01) [H04B 10/07953 (2013.01); H04B 10/29 (2013.01); H04L 9/0618 (2013.01); H04L 9/0858 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A secure repeater based quantum communication method, applied to a communication network comprising a transmitter, at least one repeater node and a receiver, the method comprising:
encrypting, by the transmitter, plaintext information to be transmitted to obtain a ciphertext;
transmitting, by the transmitter, the ciphertext to a repeater node of the at least one repeater node through a quantum communication protocol and transmitting, by the repeater node, the ciphertext to the receiver; and
receiving and decrypting, by the receiver, the ciphertext to obtain the plaintext information;
wherein the transmitting, by the transmitter, the ciphertext to the repeater node of the at least one repeater node through the quantum communication protocol and transmitting, by the repeater node, the ciphertext to the receiver comprises:
performing multiple rounds of encoded ciphertext transmission operation until the ciphertext is transmitted to the receiver;
wherein the encoded ciphertext transmission operation comprises:
in case of performing a first round of encoded ciphertext transmission operation, encrypting, by the transmitter, the ciphertext using a key in a local first key pool to obtain a first encoded ciphertext, encoding, by the transmitter, the first encoded ciphertext to single photons and transmitting, by the transmitter, the single photons to a first repeater node connected to the transmitter, and decrypting, by the first repeater node, the first encoded ciphertext to obtain the ciphertext; or
in case of performing a non-first round of encoded ciphertext transmission operation, encrypting, by a current repeater node which obtains the ciphertext through decryption, the ciphertext using a key in a local second key pool to obtain a second encoded ciphertext, encoding, by the current repeater node, the second encoded ciphertext to single photons and transmitting, by the current repeater node, the single photons to a next repeater node or the receiver connected to the current repeater node, and decrypting, by the next repeater node or the receiver, the second encoded ciphertext to obtain the ciphertext.