US 12,388,630 B2
Quantum key distribution system and operation method thereof
Kyongchun Lim, Daejeon (KR); Chun Ju Youn, Daejeon (KR); Joong-Seon Choe, Daejeon (KR); Minchul Kim, Daejeon (KR); and Byung-seok Choi, Daejeon (KR)
Assigned to ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)
Filed by ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)
Filed on Sep. 30, 2022, as Appl. No. 17/937,325.
Claims priority of application No. 10-2022-0027108 (KR), filed on Mar. 3, 2022.
Prior Publication US 2023/0283459 A1, Sep. 7, 2023
Int. Cl. H04L 9/08 (2006.01)
CPC H04L 9/0852 (2013.01) 15 Claims
OG exemplary drawing
 
1. A quantum key distribution system based on an RFI (reference frame independent) QKD (quantum key distribution) protocol, the quantum key distribution system comprising:
a quantum channel transmitter configured to generate a first quantum signal including quantum information and provide the first quantum signal to an external device through a quantum channel;
a first public channel transceiver configured to generate an optical signal including first additional information related to a QKD operation, and to transmit and receive the optical signal through a public channel;
a second public channel transceiver configured to receive the optical signal through the public channel and to generate a measurement result by measuring a circular polarization component of the optical signal;
a polarization correction circuit configured to receive the first quantum signal from the quantum channel transmitter through the quantum channel, and to generate a second quantum signal by correcting a polarization distortion of the first quantum signal based on the measurement result, the polarization distortion being caused by the quantum channel; and
a quantum channel receiver configured to receive the second quantum signal from the polarization correction circuit, and to demodulate the quantum information from the second quantum signal.