Research On Routing And Resource Allocation In Quantum Key Distribution Network

With the accelerated development of the Internet,the amount of data on the network is growing day by day,and network security is becoming more and more important.The advent of quantum computers has greatly challenged the secrecy capabilities of the classical public key systems that are currently in use.With the continuous development of quantum information science,which is a cross discipline of quantum mechanics and information theory,people have studied and developed the quantum secure communication technology.It can guarantee unconditionally secure communication,and has broad application prospect and development potential.At present,the research of quantum key agreement between peer to peer is quite mature,and the next research focus will be the network of quantum key distribution(QKD).After introducing the principle,networking mode and networking instance of QKD,this paper puts forward the network architecture of central control key distribution.Next,this paper focuses on the implementation scheme of QKD network and routing resource allocation problem.Aiming at the implementation scheme of QKD network based on trusted relay,this paper studies and analyzes the construction and working process of quantum key pool.Based on the time division of the key pool resource,the "one to many" relationship between the quantum channel and the service is realized by the time division multiplexing technology,and the storage function of the key resource in the network is realized by the storage of the key pool.In addition,this paper also proposes a QKD network model based on SDN,which can effectively realize the key management and fault handling of QKD network.According to the routing resource allocation problem in QKD networks,through the analysis of the key process of relay,this paper presents a resource balance routing algorithm Simulation results show that the algorithm can effectively reduce the blocking probability of key distribution service,realize the load balancing of key distribution service,optimize the use of key resources,and finally make the key resource consumption and distribution match.In addition,a service scheduling scheme is proposed to solve the interruption problem of key distribution in the network.Through the rotation and scheduling of the key service time slice,the long interruption of the service is avoided and the overall service quality of the network is improved.