Fault-tolerant quantum digital signature method capable of resisting collective noise

Abstract

The invention discloses a fault-tolerant quantum digital signature method capable of resisting collective noise. The fault-tolerant quantum digital signature method specifically comprises the following steps: step 1, a sender Alice generating a quantum signature and sending the quantum signature to a receiver Bob and a receiver Charlie; step 11, Alice generating two same copy sequences; step 12, the sender Alice sending the quantum signature to the receiver Bob and the receiver Charlie respectively; step 13, the receiver Bob and the receiver Charlie randomly selecting half of the received quantum signatures and sending the quantum signatures to the receiver Bob and the receiver Charlie; step 14, for all signature elements in the hand at present, the receiver Bob and the receiver Charlie being measured; step 2, the sender Alice sending an information private key pair (k, PKk) to the receiver Bob, and when the Bob meets the receiving condition, forwarding the information private key pair (k, PKk) to the receiver Charlie. According to the method disclosed by the invention, the decoherence-free subspace is introduced, and the physical quantum states with the same noise factor are utilized to form the logic quantum state, so that the quantum information is not influenced by collective noise in the transmission process, and the fidelity of the communication process is improved.

Description

technical field [0001] The invention relates to the field of quantum secure communication, in particular to a fault-tolerant quantum digital signature method capable of resisting collective noise. Background technique [0002] Quantum digital signature can guarantee the integrity and transferability of information. Document 1 "Wallden P, Dunjko V, Kent A, et al. Quantum digital signatures with quantum-key-distribution components [J]. Physical Review A, 2015, 91" proposed a quantum signature method based on key distribution components, Improved usefulness of BB84 type signatures. However, the existing quantum digital signatures are based on ideal lossless and noise-free quantum channels. During the entire transmission process of actual communication, due to factors such as thermal fluctuations, vibrations, and unsatisfactory optical fiber equipment, the polarity of particles is easily affected. , that is, the quantum state will be disturbed by the collective noise of the qu...

AI Technical Summary

Problems solved by technology

[0003] The present invention can use the existing quantum key distribution components, and considering the channel noise problem in practical applications, a fault-tolerant quantum digital signature method that can resist collective noise is designed to solve the problem that the existing quantum digital signature is less practical Poor and communication fidelity is not high

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