A method and device for improving the coding rate of a quantum key distribution system

Abstract

The invention provides a method and device for improving the code forming rate of a quantum key distribution system. The method comprises two stages, namely, a model establishment stage and a self-compensation stage, in the model establishment stage, QKD system quantum key distribution works according to an existing working mode, an excitation function network is trained according to a learning algorithm, and the self-compensation stage is started after the excitation function network is trained. In the self-compensating stage, the distribution of the quantum key of the QKD system does not work according to the existing working mode any more; the error rate of the QKD system is given by the excitation function network; all base vector measurement results in the QKD system participate in the code forming process of the system key; that is to say, the system does not need to disclose the comparison result of one group of basis vectors to obtain the error rate, and does not need to abandon one group of orthogonal basis measurement data, so that the extraction rate of the security key finally obtained through the method is high relative to the extraction rate of the initial key, and the code forming rate of the QKD system is high.

Description

technical field [0001] The present application relates to the technical field of quantum key distribution, in particular to a method and device for improving the coding rate of a quantum key distribution system. Background technique [0002] Quantum secure communication is a new type of communication technology developed in recent years. It is a new subject that combines quantum theory and information theory. It utilizes the basic characteristics of quantum physics to achieve unconditional security of communication. Among them, quantum key distribution (QKD), as the earliest commercialized branch of quantum communication technology, has attracted widespread attention and achieved rapid development for more than ten years. [0003] QKD uses the quantum properties of matter (such as photons) to design encryption and decryption schemes. Its security is based on the basic principles of quantum mechanics rather than the complexity of mathematical calculations. QKD uses the Heise...

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Problems solved by technology

[0007] This application provides a method and device for improving the coding rate of the quantum key distribution system to solve the problem of the low coding rate of the existing QKD system

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