US 11,777,722 B2
QKD method
Andrew Lord, London (GB)
Assigned to BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY, London (GB)
Appl. No. 17/759,683
Filed by BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY, London (GB)
PCT Filed Jan. 14, 2021, PCT No. PCT/EP2021/050643
§ 371(c)(1), (2) Date Jul. 28, 2022,
PCT Pub. No. WO2021/151676, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 20154838 (EP), filed on Jan. 31, 2020.
Prior Publication US 2023/0059630 A1, Feb. 23, 2023
Int. Cl. H04L 9/08 (2006.01); H04B 10/70 (2013.01); H04L 9/40 (2022.01)
CPC H04L 9/0852 (2013.01) [H04B 10/70 (2013.01); H04L 63/062 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of performing Quantum Key Distribution, the method comprising:
transmitting, in a first basis state, a first photon from a quantum transmitter to a quantum receiver;
transmitting, in a second basis state, a second photon from the quantum transmitter to the quantum receiver, the second basis state being non-orthogonal to the first basis state, and the quantum transmitter and the quantum receiver being optically connected by both a first optical channel and a second optical channel,
wherein transmitting the first photon from the quantum transmitter to the quantum receiver in the first basis state comprises:
transmitting the first photon from the quantum transmitter to the quantum receiver along either the first optical channel or the second optical channel,
wherein transmitting the second photon from the quantum transmitter to the quantum receiver in the second basis state comprises:
transmitting a first portion of a probability distribution of the second photon from the quantum transmitter to the quantum receiver along the first optical channel; and
transmitting a second portion of the probability distribution of the second photon from the quantum transmitter to the quantum receiver along the second optical channel.