Quantum key distribution phase encoder/decoder, corresponding encoding/decoding device and system

Abstract

The invention provides a quantum key distribution phase encoder / decoder and a corresponding encoding / decoding device and system. The phase encoder / decoder comprises a beam splitter, two polarization orthogonal rotation reflection devices optically coupled with the beam splitter through two arms respectively, and a phase modulator arranged on one of the two arms. One or each of the two reflection devices includes a polarization beam splitter having an input port and two output ports, and is coupled to the corresponding arms through the input port of the polarization beam splitter, two output ports of each polarization beam splitter are optically coupled with each other through polarization maintaining optical fibers comprising odd 90-degree welding points, and optical pulses output by the two output ports of each polarization beam splitter are respectively coupled to a slow axis and a fast axis of the corresponding polarization maintaining optical fiber. According to the invention, encoding and decoding interference can be stably carried out on input light pulses in any polarization state, and the problem that a system cannot stably work due to polarization induced fading in phase encoding and time bit-phase encoding quantum key distribution application is solved.

Description

technical field [0001] The invention relates to the technical field of optical transmission secure communication, in particular to a quantum key distribution phase codec based on polarization orthogonal rotation reflection, a corresponding codec device including the phase codec, and a quantum key distribution system. Background technique [0002] Quantum secure communication technology is a frontier hot field combining quantum physics and information science. Based on the quantum key distribution technology and the principle of one-time pad cryptography, quantum secure communication can realize the secure transmission of information in open channels. Quantum key distribution is based on physical principles such as the Heisenberg uncertainty relation in quantum mechanics and the quantum non-cloning theorem. It can safely share keys among users and detect potential eavesdropping behaviors. It can be applied to national defense, government affairs, Fields with high security in...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to propose a quantum key distribution phase codec based on polarization orthogonal rotation reflection, a corresponding codec device including the phase codec, and a quantum key distribution system to solve the problem of phase coding and time bit - Dilemma of phase decoding interference instability caused by polarization-induced fading in phase-encoded quantum key distribution applications

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