Relaying method for remote secure quantum communication

Abstract

The invention discloses a relaying method for remote secure quantum communication. The method is characterized in that: at least more than one relay station is arranged on a link for connecting two user terminals by a quantum channel and a high speed optical module channel, generates own relatively more independent key by adopting a phase encoding BB84 protocol, encrypts once transmitted information and generates a corresponding key in the connection of each time, and performs connection and integration by the distribution of a plurality of peer-to-peer keys to realize ultra-long range secure quantum communication. Compared with the prior art, the invention has the advantages of peer-to-peer remote secure quantum communication, high security, high system security and high transmission efficiency; and by the method, the effective transmission range of the quantum communication is greatly prolonged, and the problems of limitations to a single-system secure communication range are solved.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a relay method for remote quantum secret communication. Background technique [0002] Since the second half of the last century, scientists have gradually established the concept of quantum cryptography based on the "Heisenberg Uncertainty Principle" and "Quantum Uncloning Principle". Quantum cryptography uses a single quantum state as an information carrier. Since a single quantum state cannot be cloned, and any measurement operation will change its quantum state, eavesdroppers cannot obtain any valid information without being discovered. In other words, the legal receiver of information can know that there is eavesdropping in the channel from the change of the quantum state, thereby terminating the communication process. Therefore, this method is called a physically "absolutely secure" communication method, and has important research value in various fiel...

AI Technical Summary

Problems solved by technology

[0004] In the process of quantum secure communication, the information carrier is single photon. Considering the attenuation of single photon in the optical fiber channel and the detection efficiency of detectors, the communication distance of commercial systems generally does not exceed 100km. This limitation makes point-to-point quantum communication The system can only be applied to inter-city secure communication, but it is powerless for inter-provincial and inter-provincial secure communication, which greatly limits the scope of use of quantum secure communication, and also hinders the development of its practical application.

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