A cascade decoding method suitable for data post-processing in cv-qkd system

Abstract

The invention relates to the field of communication security. The invention discloses a concatenated decoding method suitable for post-processing of data in a CV-QKD system. A method of combining long code length coding with medium and short code length coding is adopted. Code error correction to quickly reduce the number of errors to a preset threshold in a small number of iterations, then reduce the length of the error correction code, regroup all bits, and group the sender and receiver based on the check function The codewords are verified, the codewords with inconsistent verification results are grouped, and the medium and short code length codes are used for error correction, and finally all errors are corrected to complete the decoding. The invention fully combines the advantages of different code length coding technologies, and improves the error correction rate while ensuring the error correction success rate, thereby ensuring the overall performance of the CV-QKD system.

Description

technical field [0001] The invention relates to the technical field of communication security, in particular to a cascade decoding method suitable for post-processing of data in a CV-QKD system. Background technique [0002] With the development of quantum computing technology, classical cryptosystems based on computational complexity face major security risks. Quantum Key Distribution (QKD) is a key distribution system based on the principles of quantum physics, which has unconditional security and has attracted extensive attention and research. Continuous Variable Quantum Key Distribution (CV-QKD) uses the orthogonal component of the optical field as the information carrier. Most of the devices are common to classical coherent optical communication, and have good compatibility with traditional optical communication networks. Prospects. The current CV-QKD system is mainly implemented based on the GG02 protocol, that is, the Gaussian modulation coherent state transmission ...

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Problems solved by technology

[0015] In the current CV-QKD system data post-processing, the number of iterations caused by a small number of errors in the iterative process when using polygonal LDPC codes for error correction increases significantly, and the problem of error correction and decoding failure within the specified number of iterations, this paper The invention proposes a cascaded decoding method suitable for CV-QKD system data post-processing. Compared with the existing schemes that simply use polygonal LDPC codes to decode and correct errors, the cascaded decoding scheme proposed by the present invention is sufficient Combining the advantages of different code length coding techniques, first use long code length coding to correct most of the errors in a small number of iterations, then reduce the length of error correction coding, and use a more appropriate code word grouping for still errors Medium and short code length codes for error correction, thereby ensuring the success rate of error correction and improving the error correction rate

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