Double-field quantum digital signature method based on discrete phase random source

Abstract

The invention discloses a double-field quantum digital signature method based on a discrete phase random source, and the method specifically comprises the following steps: 1, a sender Alice and a receiver Bob generate a final key, specifically comprising steps 11-16, and the sender Alice and a receiver Charlie generate the final key in the same manner; step 2, the sender Alice and the receiver generate a quantum signature sequence, and the receiver Bob and Charlie randomly select half quantum states of the receiver Bob and Charlie for exchange; and step 3, the sender Alice sends the information and the signature to the receiver Bob, the Bob forwards the information and the signature to the Charlie for verification after verification is passed, and the information is received if the Charlie verification is passed. The discrete phase random source is adopted in the two modes in the key generation stage, the problem that a continuous phase random source is difficult to implement in practical application is solved, the performance can reach the performance of the continuous phase random source, and the signature rate and the communication safety are remarkably improved.

Description

technical field [0001] The invention relates to the field of quantum secure communication, in particular to a double-field quantum digital signature method based on a discrete phase random source Background technique [0002] Quantum digital signature is a technology that uses quantum physical characteristics and information limit theory to ensure communication security. Existing quantum digital signatures are mainly divided into BB84 type and MDI type, and it is difficult to achieve a good balance between security and practical performance. For example, when using the BB84-type QDS protocol, a high signature rate can be obtained, but the security is poor. In contrast, the MDI-type QDS protocol has higher security but worse signature rate. Most importantly, neither protocol type can exceed the fundamental limit of channel capacity without quantum repeaters. In order to overcome this limitation of the existing QKD protocol, literature 1 "Lucamarini, M, Yuan, et al. Overcom...

AI Technical Summary

Problems solved by technology

[0003] The present invention adopts a quantum distribution method with a discrete random phase source in the key generation stage, and designs a quantum digital signature protocol. The purpose of the present invention is to provide a double-field quantum digital signature method based on a discrete random phase source for Solve the problems that existing quantum digital signatures are limited by channel capacity, have low practicability and low security

Images