Hybrid automatic retransmission method for continuous variable quantum key distribution

Abstract

The invention discloses a hybrid automatic retransmission method for continuous variable quantum key distribution. A decoding calculation unit of a sending end performs error correction negotiation with a receiving end when performing coding calculation according to discrete data, a check matrix and check sub-data; and a check sub-calculation unit of the receiving end performs error correction negotiation with a sending end when performing check sub-calculation according to the discrete data and the check matrix. Compared with the prior art, the method has the following positive effects: in anactual CV-QKD system, due to the fact that quantum signals are very weak, the influence of channels on the quantum signals is very large, so that a conventional scheme adopting a fixed error correction matrix is relatively high in frame error rate. According to the hybrid automatic retransmission method for the continuous variable quantum key distribution, by adopting hybrid automatic retransmission, the frame error rate of the CV-QKD system can be reduced, so that the security code rate is improved.

Description

technical field [0001] The invention relates to a hybrid automatic retransmission method for continuous variable quantum key distribution. Background technique [0002] With the development of quantum computing technology, classical cryptosystems based on computational complexity face major security risks. Quantum Key Distribution (Quantum Key Distribution, QKD) is a key distribution system based on the principle of quantum physics, which has unconditional security and has attracted extensive attention and research. [0003] Quantum key distribution technology is mainly divided into discrete variable quantum key distribution (Discrete Variable Quantum key Distribution, DV-QKD) and continuous variable quantum key distribution (Continuous Variable Quantum Key Distribution, CV-QKD) two categories. Compared with DV-QKD, CV-QKD has the advantages of high potential code rate, no need for single photon detectors, and good integration with classic optical fiber communication networ...

AI Technical Summary

Problems solved by technology

However, after the weak quantum signal is transmitted through long-distance optical fiber, the signal-to-noise ratio is very low, resulting in a very high bit error rate of the original data of the sender and receiver of the key distribution, and it is extremely difficult to correct the error. This is also the main problem of the CV-QKD system. technical bottleneck

[0005] In the actual data negotiation process, it is difficult to guarantee a 100% error correction success rate for a specific error correction matrix

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