Star quantum key distribution network still capable of ensuring safety without trusted relay

Abstract

The invention discloses a star quantum key distribution network without a trusted relay based on a MDIQKD protocol. The star quantum key distribution network disclosed by the invention is expanded into a star network structure based on a point-to-point MDIQKD system; therefore, network resource consumption is saved; and the difficulty due to network expansion can be solved. According to a light source structure provided by the invention, equipment used in a time feedback scheme, a phase feedback scheme and a polarization feedback scheme is simple and reusable; therefore, the quantum key distribution network is relatively simple, relatively easy to integrate and low in cost; furthermore, feedback requirements can also be reduced through further optimization; and thus, the foundation is laid for further realizing safety, high-speed, large-scale engineering treatment and practicability of quantum secret communication.

Description

technical field [0001] The invention relates to the technical field of optical fiber transmission quantum secret communication, in particular to a star-shaped quantum key distribution network in which a trusted relay can still guarantee security and high speed and stability. Background technique [0002] Quantum secure communication is an emerging subject combining quantum mechanics and modern cryptography. Quantum secure communication includes research directions such as quantum key distribution, quantum secret sharing, quantum secure direct communication, and quantum identity authentication, among which the most commonly used ones have gradually been put into practical use. One class is quantum key distribution. Since quantum key distribution is based on the basic principles of quantum mechanics, coupled with the "one-time secret" communication method, it ensures the absolute security of communication at the physical level. It is very important for the defense units, finan...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the existing trusted relay-based QKD network is vulnerable to attacks and causes insecurity, the present invention proposes a safe, high-speed and stable quantum key distribution network that does not require a trusted relay. The network is based on The MDIQKD protocol forms a star-shaped MDIQKD network, which does not require its central node to be a trusted relay, which greatly improves the security of the entire network

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