A Hybrid Automatic Retransmission Method for Continuously Variable Quantum Key Distribution

Abstract

The invention discloses a hybrid automatic retransmission method for continuous variable quantum key distribution. The decoding calculation unit at the sending end performs correction with the receiving end when performing decoding calculations based on discrete data, check matrix and syndrome data. Error negotiation; the syndrome calculation unit at the receiving end performs error correction negotiation with the sending end when performing syndrome calculation based on the discrete data and the parity check matrix. Compared with the prior art, the positive effect of the present invention is: in the actual CV-QKD system, because the quantum signal is very weak, the influence of the channel on the quantum signal is very large, resulting in frame error in the conventional scheme using a fixed error correction matrix The rate is higher. A hybrid automatic retransmission method for continuous variable quantum key distribution proposed by the present invention adopts hybrid automatic retransmission, which can reduce the frame error rate of the CV-QKD system, thereby improving the security code rate.

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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