Key generation method and device applied to quantum communication

Abstract

The invention discloses a secret key generation method and device applied to quantum communication, and the method comprises the steps: obtaining a first secret key formed between two communication parties of the quantum communication, and the first secret key can be an original secret key or a screened secret key; the first keys are grouped, and the error rate of each key group is obtained; classifying the key groups according to the error rate of each key group to obtain classified key groups, and combining the key groups of the same type to obtain a combined key; and performing data post-processing on the combined key to obtain a final key of the two communication parties. Since the keys are grouped according to the error rate of the keys, the keys with low error rate can be obtained, the key generation efficiency is improved, the transmission distance and the code rate are improved, the key distribution efficiency can be improved by improving the code rate, and the quantum communication efficiency is further improved.

Description

technical field [0001] The invention relates to the technical field of quantum communication, in particular to a key generation method and device applied to quantum communication. Background technique [0002] Through quantum communication technology, unconditional and secure confidential communication can be realized, and the application prospect is very broad. After years of development, the theory of quantum communication technology has gradually improved, the technology has gradually matured, and it has entered a stage of large-scale use. [0003] Since the quantum state is very fragile and easily affected by environmental noise, the practical quantum communication distance is still limited to 100 kilometers, and the communication rate is still relatively low. Improving the communication distance between a single pair of devices and improving the communication rate are also quantum communication technologies. One of the main technical problems faced in the development p...

AI Technical Summary

Problems solved by technology

[0003] Because the quantum state is very fragile and easily affected by environmental noise, etc., the current practical quantum communication distance is still limited to 100 kilometers, and the communication rate is still relatively low. Improving the communication distance between a single pair of devices and increasing the communication rate are also quantum communication technologies. One of the main technical problems faced in the development process

For example, in the prior art, the screening key in quantum communication is used for verification, and only the verification key is kept, thereby reducing the error rate and increasing the transmission distance of quantum communication. However, since only the verification key is retained in this way, Effective examples will be discarded, which will reduce the efficiency of key distribution and make communication less efficient

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