Quantum key distribution-oriented variable step size blind information coordination method

Abstract

The invention discloses a quantum key distribution-oriented variable step size blind information coordination method, which adopts a blind coordination protocol process, and comprises the following steps of setting s = 0, p = d and delta 0 = 0, p being the number of symbols, s being the number of positions in a code word jointly determined by a sending party and a receiving party, and n being thewhole code length; and if the receiver cannot successfully complete coordination, enabling the sender to consider that the error rate is greater than the original anticipated condition, and releasingthe cutting position information delta i with the variable step length to the receiver. The method has the advantages that the contradiction between the coordination efficiency and the protocol execution time can be relieved, the coordination efficiency is improved, and the protocol execution time is shortened.

Description

technical field [0001] The invention mainly relates to the technical field of quantum communication, in particular to a variable-step blind information coordination method oriented to quantum key distribution. Background technique [0002] Quantum key distribution needs to go through two stages: quantum signal transmission stage and classical information processing stage. Both the sender and the receiver who will share the key first obtain the rough key through the quantum channel, but due to factors such as the limited efficiency of the key distribution protocol itself, the imperfection of the actual device, and the eavesdropping of the third party, the rough key is usually There will also be bit errors and information leakage that are inconsistent between the two parties. Therefore, in the classical information processing stage, in order to purify the coarse key, the data strings obtained by both parties of the key distribution must be coordinated to ensure that both ends...

AI Technical Summary

Problems solved by technology

But the error rate estimation will also bring a series of problems: (1) The reduction of the final key rate

The key disclosed by both the sender and the receiver on the public channel can no longer be called a "key". Once it is released, it needs to be deleted from the final key chain. A certain amount of information will directly affect the key rate of the entire quantum key distribution system

(2) Poor adaptability of error correction coding

However, there is a contradictory relationship between the efficiency of the protocol and the time spent on the protocol

When the value of t is larger, the efficiency of the protocol is better, but at the same time, it also means that the number of coordinated interactions is also more, and the communication link has a delay, especially in a complex network environment, the protocol will run longer.

[0019] However, in a quantum key distribution system, the time spent in post-processing will largely determine the rate at which the final key is generated

If the post-processing takes too much time, it will be difficult to keep up with the speed of the key distribution process in the quantum channel, slowing down the protocol execution cycle of the entire quantum key distribution system, or losing information due to rate mismatch in the post-processing In the case that the unprocessed rough key cannot obtain an effective shared key, it cannot reflect the key distribution performance of the entire key distribution protocol

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