Error code negotiation method and device for discrete quantum key distribution system

Abstract

The invention provides an error code negotiation method and device for a discrete quantum key distribution system for simultaneously improving the processing rate and the negotiation efficiency, and belongs to the technical field of quantum communication. The method comprises the following steps: performing scrambling processing on a data block D; performing random sampling on scrambled data to obtain sampled data Ds; correcting and decoding the sampled data Ds by using an interactive negotiation algorithm, obtaining an estimated error rate by using the relationship between the first round ofparity bits and the error rate, and executing an initialization work via a forward error correction negotiation algorithm when the interactive negotiation algorithm waits for the interaction information in the first round; performing, by the forward error correction negotiation algorithm, adjustment based on the estimated error rate, completing, by the interactive negotiation algorithm, the remaining multi-round error correction decoding work of the sampled data, and decoding, by the forward error correction negotiation algorithm, the remaining data after sampling in each round of waiting forthe interaction information; and splicing the decoding results of the interactive negotiation algorithm and the forward error correction negotiation algorithm according to the orders before the scrambling.

Description

technical field [0001] The invention relates to a bit error negotiation algorithm, in particular to a bit error negotiation method and device for a discrete quantum key distribution system, and belongs to the technical field of quantum communication. Background technique [0002] The function of the bit error negotiation algorithm is to correct the error bits in the screening code in Quantum Key Distribution (QKD). Bit error negotiation is the most concerned link in QKD post-processing. [0003] The existing bit error negotiation algorithms include two categories: interactive bit error negotiation algorithm and forward error correction error bit negotiation algorithm; among them, Cascade algorithm is the representative algorithm of interactive bit error negotiation algorithm, and LDPC-based bit error negotiation algorithm The algorithm is a representative algorithm of forward error correction type error negotiation algorithm. [0004] The original Cascade algorithm was pro...

AI Technical Summary

Problems solved by technology

Although the LDPC algorithm does not need to wait for a long time for interaction and has a fast processing rate, the negotiation efficiency of the LDPC error negotiation algorithm is not very good in the case of a low bit error rate, and the LDPC negotiation algorithm needs to obtain the bit error rate of the channel in advance before processing. When the bit error rate fluctuates, the negotiation performance of the forward error correction negotiation algorithm will be poor.

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