A Quantum Key Relay Method and Device Based on Centralized Management and Control Network

Abstract

The embodiments of the present invention relate to the field of communication technology, and in particular to a quantum key relay method and device based on a centralized management and control network, so as to determine a globally optimal key relay instruction. The embodiment of the present invention is applicable to a centralized management and control network. The centralized controller obtains Z service requests, and according to the identification of the source service node, the identification of the target service node, and the quantum key consumption corresponding to each of the Z service requests Parameters, as well as the topology information of the key nodes in the centralized management and control network, determine the globally optimal key relay instructions corresponding to G service requests from a global perspective, and further relay the keys corresponding to G service requests The instruction is issued to each key node corresponding to the key relay instruction, so that each key node performs quantum key relay according to the key relay instruction, and a shared key node is generated between the source key node and the target key node. quantum key.

Description

technical field [0001] The embodiments of the present invention relate to the field of secure communication, in particular to a quantum key relay method and device based on a centralized management and control network. Background technique [0002] Quantum cryptography is a cross product of quantum mechanics and cryptography. Its security is guaranteed by the principle of quantum mechanics. Any operation that attempts to intercept or measure the quantum key will change the quantum state. The receiving end can judge whether the communication process is There is an eavesdropper, so it can be determined whether to discard the key this time, thus bringing unconditional security to the communication. [0003] A quantum key network node is generally composed of a classical communication terminal connected to a classical communication network and a quantum device terminal connected to a quantum key distribution (Quantum Key Distribution, QKD) network. In classical communication, t...

AI Technical Summary

Problems solved by technology

In classical communication, the problem of channel loss is solved by using amplifiers, but due to the limitation of the unclonability of quantum signals, quantum communication cannot directly adopt the "recovery-amplification" relay process in classical communication

At the same time, during the transmission process, the channel attenuation will increase with the increase of the distance. When the distance between the sending end and the receiving end is greater than the effective transmission distance, the average photon number at the receiving end will be very small. When the average photon number and single When the dark counts of photon detectors are compared, it is basically impossible to generate secure keys anymore

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