A Quantum Key Distribution System Based on Fast Polarization Feedback

Abstract

The invention provides a quantum key distribution system based on fast polarization feedback. The system comprises a quantum key distribution transmitter and a quantum key distribution receiver, wherein the quantum key distribution transmitter and the quantum key distribution receiver are arranged at two ends of a power overhead cable; the quantum key distribution transmitter comprises a quantum key distribution (QKD) transmitting end and a fast polarization feedback receiving end; the quantum key distribution receiver comprises a QKD receiving end and a fast polarization feedback transmitting end; the QKD receiving end is used for receiving a quantum key; the fast polarization feedback transmitting end is used for transmitting and modulating the linear polarization light; the QKD transmitting end is used for transmitting the quantum key; the fast polarization feedback receiving end is used for receiving and demodulating the linear polarization light. Compared with the prior art, the quantum key distribution system based on fast polarization feedback provided by the invention is used for tracking feedback of quick polarization by adopting an optical fiber link opposite to normal QKD, the polarization change of a quantum key transmission signal in the overhead cable can be quickly detected and the variation can be compensated. Thus, the condition that QKD equipment at the other end of the overhead cable normally works is ensured.

Description

technical field [0001] The invention relates to a quantum key distribution system, in particular to a quantum key distribution system based on fast polarization feedback. Background technique [0002] Compared with classical encryption and decryption, the principle of quantum secure communication is unconditionally secure. Applying quantum secure communication to the power transmission network can ensure the security of the core data of the power transmission network. Quantum secure communication usually uses fiber optic channels as the transmission path; however, in power grids, fiber optic links are usually laid by overhead cables; when using overhead cables to transmit QKD signals, due to the industry characteristics of the cables themselves and power overhead lines are usually laid On the iron tower, the line is disturbed by the weather environment such as strong wind and frost, which causes the light polarization in the power overhead line to change drastically, which ...

AI Technical Summary

Problems solved by technology

Quantum secure communication usually uses fiber optic channels as the transmission path; however, in power grids, fiber optic links are usually laid by overhead cables; when using overhead cables to transmit QKD signals, due to the industry characteristics of the cables themselves and power overhead lines are usually laid On the iron tower, the line is disturbed by the weather environment such as strong wind and frost, which causes the light polarization in the power overhead line to change drastically, which has a great impact on the quantum key distribution system that uses the single photon polarization state as the key to code. It even caused the power overhead line to fail to work normally

Images