Controlled Quantum Secure Direct Communication Protocol Design And Simulation

Quantum communication is a new communication method that combines quantum theory and communication technology.Using the basic principles of quantum physics,quantum communication can achieve unconditional security,which has attracted more and more attention and research.In recent years,with the deepening of research,quantum secure direct communication has become one of the important research branches of quantum communication.In quantum secure direct communication,thecommunication parties do not need to share the secret key before the communication,they encode the secret information in the quantum state and complete the communication directly.Therefore,quantum security direct communication puts higher requirements on security.The main content of this paper is to design a quantum security direct communication protocol with higher security.The new protocol is simulated by classical computer,and its security and feasibility are analyzed.What we have done in this paper are as follows:(1)A novel controlled quantum secure direct communication protocol is proposed based on four-particle cluster.In this protocol,the channel particles are prepared by the controller,and the sender can use the cluster state to send two bits of secret information each time.The receiver can recover the secret messages only under the permission of the controller.The protocol uses photons as decoy particles to guarantee the security of the transmission of particles and it can also be used to verify the identity of the communicators to ensure the security of communications.It's showed that the proposed protocol can against several attacks through calculation and analysis.Meanwhile,by analyzing the joint rotation noise and joint dephasing noise existing in the quantum channel,this paper designs a solution under the noisy channel.(2)Simulation of the protocol.By analyzing the quantum system,we use JAVA to simulate quantum measurement and other quantum operations in classical computer.Then,we simulates the proposed protocol and verifies the feasibility of the protocol.At the same time,we simulates several common quantum attack strategies and simulates the communication process of the protocol under these attacks,the results verifies the security of the proposed protocol.In addition,through the simulation of the noise channel,the feasibility of the proposed solution under the noisy channel is verified.