A key error correction method and a quantum key distribution system

Abstract

The invention discloses a key error correction method and a quantum key distribution system, and the method comprises the steps: carrying out the error correction of a to-be-corrected key through employing a mode that parity check is combined with Hamming codes, specifically, enabling a first QKD terminal to divide the to-be-corrected key of a home terminal into at least two groups, and informinga second QKD terminal of the parity check code of each group; the second QKD terminal realizing the same group as the first QKD terminal for the to-be-corrected secret key of the home terminal, determining the parity check codes of each group, and determining which groups are inconsistent at two ends by comparing the parity check codes of the same group at the two ends; therefore, one end, namelythe first QKD terminal, can be subjected to grouped error correction through the Hamming code, so that one round of error correction is completed. According to the invention, the number of interactiontimes between two QKD devices can be greatly reduced, so that the error correction efficiency is improved, and the information leakage amount is reduced.

Description

technical field [0001] The present application relates to the technical field of quantum key distribution, in particular to a key error correction method and a quantum key distribution system. Background technique [0002] The fundamental difference between QuantumKey Distribution (QKD) and the classical key system is that it uses different quantum states of photons as the carrier of the key, and the basic principles of quantum mechanics guarantee that the process cannot be eavesdropped or deciphered. , thus providing a more secure key system. see figure 1 The schematic diagram of the QKD system is shown, two QKD terminals Alice and Bob in the QKD system are used to generate the same quantum key, specifically, Alice sends the original key data to Bob through the quantum channel, after that, Alice and Bob use The classic channel communicates, extracts the data with the same base vector from the original key data to complete the data screening, obtains the Sifted Key after s...

AI Technical Summary

Problems solved by technology

In the process of commercializing QKD equipment, due to the large delay or uncertainty of the classic network used, if there are many errors in the keys at both ends (for example, more than 3%), it will require multiple rounds of interaction to complete all errors. Bit error correction is likely to cause error correction to be unable to be completed within a limited time, and the processing bandwidth is insufficient, resulting in Alice and Bob not being able to output keys normally

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