Quantum key distribution after-treatment system and method based on polar code correction

Abstract

The invention discloses a quantum key distribution after-treatment system and a quantum key distribution after-treatment method based on polar code correction. The system comprises a key screening module, a parameter estimation module, a polar code correction module, a consistency verification module and a privacy amplification module which are connected in sequence. The method comprises the following steps: only keeping original keys with the same base selection to form screening keys after quantum bite information is transmitted on a quantum channel; commonly selecting partial key bits from the screening keys to perform disclosed comparison; coding and decoding undisclosed key bits by adopting a system polar code algorithm under the condition that the quantum bit error rate is not higher than a safety threshold value; verifying the consistence of the corrected quantum keys by adopting cryptographic algorithm; and calculating safety information entropy and performing information compression to obtain absolutely safe key bits. The quantum key distribution after-treatment system has linear coding / decoding complexity characteristics, so that the after-treatment time delay and key length increase have linear relationship, and the after-treatment speed is improved.

Description

technical field [0001] The invention relates to the technical field of communication and information security, in particular to a post-processing system and method for quantum key distribution based on polar code error correction. Background technique [0002] Quantum Key Distribution (Quantum Key Distribution, QKD) can distribute security keys for both parties in the communication in an absolutely secure manner. Combining with the "one-time pad" encryption scheme, it can build a security system that cannot be broken by quantum computers. It is an important direction of interdisciplinary research between information security and quantum physics in the post-quantum era. At the same time, quantum key distribution is also the first practical technology of quantum information science. Its unconditional security is of great significance and role in the information security and protection of military, banking, government, etc., so it has been accepted by governments all over the w...

AI Technical Summary

Problems solved by technology

The existing post-processing of quantum key distribution has certain limitations in speed and efficiency. The main problem lies in the time delay and bit overhead caused by the two parts of error correction and data verification, which reduce the quantum The key generation rate of key distribution has thus become a "bottleneck" for the development of next-generation high-speed quantum key distribution systems

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