Research On And Simulation Of Key Management And Performance Of Quantum Communication Network

Quantum cryptography communication based on quantum key distribution(QKD)is one of the most rapidly developing quantum information technologies and has been applied in engineering,there are already some small-scale quantum cryptography communication networks now.With the further development of quantum communication,there will inevitably be large-scale quantum communication network.It is necessary to simulate the performance of large-scale network to provide references for the future plan and construction.The simulation capacity is limited for a single computer,so we established a distributed simulation platform to enhance the simulation capacity.A safe and effective quantum key management scheme can not only guarantee the security of keys,but also reduce the end to end delay,balance the usage of link resources and improve the ability to resist risks.In addition,with the development and popularization of quantum communication,more business such as video or FTP will access to the quantum communication network besides the basic voice business.Therefore,in this thesis,we focus on the quantum key management technology,and realize the access of multi-business to the distributed simulation platform based on the key management.Firstly,this thesis describes the characteristics of classical and quantum cryptography communication and followed by the development of quantum cryptography communication.Secondly,the related theories of quantum communication are introduced,such as the Heisenberg uncertainty principle,quantum no-cloning theorem,and quantum entanglement.Then,quantum key distribution protocol and the principle of quantum trusted relay are introduced.Thirdly,a model of quantum key management,which consists of key generator layer,resource management layer and strategy controller layer,is proposed according to quantum communication network architecture and its working principle.We analyze the advantages of using the node degree and the key update rate as the weight for routing algorithm in the resource management layer,and realize this kind of key management on distributed simulation platform.Moreover,the relationship between the various parameters and the optimal parameters,including key block size,key packet transmission frequency and the parameter a of routing algorithm,are obtained by theoretical analysis and multiple simulations.Fourthly,we optimize the simulation model of quantum communication network,and the model can be applied to wide-area quantum cryptography communication network based on satellite.Then we study the key technologies for multi-business to access to distributed simulation platform for quantum communication network,and also realize the access combined with the key management proposed before.We simulate the network performance for multi-business and also give our analysis.In the end,we summarize the work in this thesis,analyze the problems existing in key management model and the distributed simulation platform,and propose suggestions for future work.