Freely-operated reference-system-independent quantum key distribution method

Abstract

The invention discloses a free-running reference system-independent quantum key distribution method, which comprises the following steps of: initializing measurement results, combining the measurement results, performing security analysis, generating a security key, distributing multiple groups of measurement results of three basis vectors in a quantum communication stage, calculating a reference system deflection angle according to an error rate of each group of measurement results, and generating a quantum key. And then dividing the measurement results with similar deflection angles into the same set and merging the measurement results, calculating the amount of leaked information and counting single photons for the merged measurement result set, and finally, merging all the measurement results, calculating the total security key rate and generating a final key. The method can be applied to a reference system fast random drift environment, and a farther transmission distance and a higher key rate can be achieved.

Description

technical field [0001] The present invention relates to the technical field of quantum secure communication, and more particularly, to a free-running reference frame-independent quantum key distribution method. Background technique [0002] Quantum key distribution based on quantum mechanics can provide unconditionally secure communication for both parties. In recent years, quantum key distribution systems have developed rapidly and have moved from the laboratory to social life, such as 509km optical fiber quantum key distribution, 4600km satellite-to-ground quantum key distribution, and 1km distance-based UAV-based entanglement distribution, etc. . [0003] In practical quantum key distribution systems, the rapid random drift of the reference frame will shorten the transmission distance and reduce the security key rate. Existing solutions mainly include reference frame real-time calibration and the use of reference frame-independent quantum key distribution protocols. Th...

AI Technical Summary

Problems solved by technology

However, the increase of the reference frame deflection range of the reference frame-independent quantum key distribution protocol will directly reduce the transmission distance and key rate, and the maximum deflection range of the reference frame in each round of distribution process is π

At the same time, the time drift of the reference frame and the maximum deflection tolerance range of the reference frame will reduce the key accumulation time, which cannot effectively weaken the effect of the finite code length, resulting in the limitation of the transmission distance and key rate of the reference frame-independent quantum key distribution protocol.

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