Continuous variable secret key distribution method based on biphase modulation and data post-processing

Abstract

The invention provides a continuous variable secret key distribution method based on biphase modulation and data post-processing. The method comprises the following two portions of a first portion, abiphase modulation portion; and a second portion, a novel data post-processing portion in which secrecy strengthening is performed firstly and then secret key negotiation is performed, wherein in thebiphase modulation portion, two phase modulators are adopted to carry out information modulation on a quantum coherent state so as to realize perfect Gaussian modulation; and in the novel data post-processing portion, the secrecy strengthening is performed firstly and then the secret key negotiation is performed in a data post-processing phase. In the invention, a new modulation mode is realized;and a new data post-processing scheme can be used to increase a data post-processing speed so that a safe secret key rate of a whole continuous variable quantum secret key distribution system is increased.

Description

technical field [0001] The present invention relates to a key distribution method, in particular to a continuous variable key distribution method based on bi-phase modulation and data post-processing. Background technique [0002] Under the background of the rapid development of computer information technology, the requirements of information technology for information security are increasing day by day. Quantum key distribution (QKD), as an important branch of quantum communication, has attracted more and more attention due to its ability to physically guarantee the unconditional security of quantum communication. [0003] QKD technology can be generally divided into two categories: discrete variable quantum key distribution (DVQKD) and continuous variable quantum key distribution (CVQKD). Compared with discrete variable quantum key distribution technology, CVQKD has the characteristics of potential high bit rate and very good integration of classical optical fiber communi...

AI Technical Summary

Problems solved by technology

However, in the security enhancement stage, nearly 90% of the key strings still need to be compressed by the security enhancement algorithm

In this way, a large amount of data needs to be negotiated during the key negotiation phase, but most of the negotiated keys need to be removed, which will cause the post-processing data processing to become very slow, resulting in the key rate of the entire CVQKD system very low

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