Research On Security And Simulation Of Quantum Communication Protocol

Quantum informatics is a emerging discipline that integrates multiple research fields and directions to make the study of quantum mechanics more colorful.As an important research direction of quantum informatics,quantum communication mainly uses the properties of entanglement and coherent superposition of quantum states to complete certain tasks through quantum channels or classical channels.So far,quantum communication is the only communication mode considered to be absolutely secure.It is this unique advantage that makes quantum communication one of the most attractive fields of science and technology at present,so researching quantum communication has very important strategic significance and huge application prospects.The research in this thesis mainly involves two aspects of quantum communication protocols,namely,research on quantum secure direct communication protocols,and research on quantum key distribution protocols.In terms of quantum secure direct communication protocols,a quantum secure direct communication protocol based on super entangled states is proposed.Particles in super entangled states are used as detection particles and randomly inserted into the two-step quantum secure direct communication particle stream for wiretapping detection.In security analysis,the entropy theory method is used to calculate the amount of information.By establishing the functional relationship between the maximum amount of information that the eavesdropper can obtain and the probability of being detected,the eavesdropping detection of the two quantum secure direct communication protocols is quantitatively compared effectiveness.After analysis and calculation,if the eavesdropper wants to obtain all the information,the lower bound of the probability of eavesdropping detection in the original two-step quantum communication protocol is 50%,while in the protocol proposed in this thesis,the lower bound of the probability of eavesdropping detection can reach 75%,which proves that the quantum secure direct communication protocol proposed in this thesis has higher eavesdropping detection efficiency.In terms of quantum key distribution protocol,a simulation algorithm based on Monte Carlo method for quantum B92 protocol and quantum SARG04 protocol is proposed.We first analyze the theoretical values of the transmission success rate and bit error rate of the two communication protocols,then introduce the mean square error to measure the similarity between the theoretical data and the simulated data,and finally use the Monte Carlo method for the simulation experiment.Through simulation experiments,the mean square error simulation result of B92 protocol can reach to 3.016*10-5,and the mean square error simulation result of SARG04 protocol can reach to 1.921*10-5,which proves that the simulation algorithm proposed in this thesis is correct.In addition,the time complexity of the simulation algorithm and the reason for the error of the simulation algorithm are also given.