Multiparty quantum key distribution system error correction method

Abstract

The invention relates to a multiparty quantum key distribution system error correction method, which comprises the following steps: S1) calculating system error rate; S2) finding an optimal segment length sequence according to the system error rate; S3) carrying out loop iteration execution of the following steps: S3.1) carrying out data rearrangement; S3.2) carrying out segmentation on sender original key and distribution key according to the optimal segment length, calculating odd-even checksum of the segmented key of a sender and a receiver respectively, comparing operation results of the sender and each receiver to obtain the segmented keys, the operation results of which are different; S3.4) through a Winnow error correction algorithm, finding the error bit position; and S3.4) according to the error bit position, carrying out inversion on the 0 or 1 value at the corresponding position in a shared key of each receiver until reaching the largest iteration times and stopping cycle; and S4) checking the error correction result, if each receiver corrects error successfully, ending the operation, and if at least one receiver fails error correction, discarding the corresponding key. The multiparty quantum key distribution system error correction method is high in reliability and error correction efficiency, and can be suitable for multiparty quantum key distribution system error correction.

Description

technical field [0001] The present invention relates to the technical field of quantum communication, in particular to the technical field of quantum key distribution, and in particular to an error correction method for a multi-party quantum key distribution system. Background technique [0002] The security of quantum communication depends on quantum key distribution. Quantum key distribution is based on quantum physics and informatics and is considered to be the most secure encryption method. It requires a quantum channel for transmitting quantum states and a Authenticable (error-free) classical channels for classical interactions. [0003] In multi-party quantum communication, suppose A sends the same data to n receiving ends. If different keys are used, A needs to prepare n strings of keys and send them to the receiving ends respectively. The receiving ends perform error correction respectively, and A needs to use These n strings of keys encrypt the data to be sent. Us...

AI Technical Summary

Problems solved by technology

However, this method is only suitable for two-party error correction and cannot be directly applied to multi-party error correction.

Moreover, this error correction method does not select the optimal segment length, and it needs to continue to loop until the keys of both parties are consistent, which is tedious and cumbersome

[0016] The key distribution process only involves key distribution issues, and does not involve error correction after distribution, nor does it provide corresponding error correction methods, and the reliability is not high

[0017] Or only applicable to two-party error correction, not directly applicable to multi-party error correction

[0018] In the existing Winnow error correction method, the error correction method does not select the optimal segment length, and it needs to continue to loop until the keys of both parties are consistent, which is relatively tedious and cumbersome, and is only applicable to two-party error correction, and cannot be directly applied to multi-party error correction

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