Research On Key Technologies Of Distributed Simulation Of Quantum Communication Network

Quantum communication has developed rapidly in recent years,especially with the implementation of China's "Beijing-Shanghai trunk line" project,its size increased enormously and it entered the large-scale application quantum communication network stage.With the purpose of effectively guiding the construction of large-scale quantum communication network and accurately estimating its performance,we research on the large scale quantum communication network by simulation.This thesis researches on the key technology of distributed simulation of large-scale quantum cryptography communication network.Firstly,we introduce several typical quantum cryptography network,describe the development of distributed simulation,and explain the significance of distributed simulation of quantum communication network.Secondly,we introduce the system model and network architecture of the quantum cryptography communication network briefly,describe some basic knowledge of High Level Architecture(HLA)and OPNET simulation software,including HLA's basic concept and composition and OPNET simulation mechanism and its model structure.Thirdly,we propose the design scheme of the distributed simulation system of quantum communication network,design and implement several key modules in the distributed system,including the console unit,the data interaction model and the system resource configuration module.Moreover,we explain each module from both the view of practical sense and implementation point.Based on the above several modules,we establish the distributed simulation experimental system of quantum communication network,and initially achieve the goal of distributed simulation of large-scale quantum cryptography communication network.Simultaneously,we analyze the performance of this system,and the analysis shows that the performance of this system needs to be further improved.Fourthly,in order to improve the simulation efficiency,on the distributed simulation experimental system of quantum communication network,we research on several key factors influencing the simulation performance.We redesign an efficient HLA agent node based on the analysis of the disadvantages of HLA-PM;We significantly improve the efficiency of the simulation experimental system by studying the parallel simulation mechanism and the time management mechanism of OPNET;We study the key parameters affecting simulation efficiency,including the number of core and the time window in the parallel simulationmechanism as well as the time step and time look-ahead in the time management mechanism,propose a general method to optimize the parameters and apply it to the configuration of the distributed simulation system.We analyze the performance of the improved simulation system,and the results show that the performance of the improved distributed simulation system enhances significantly compared with the simulation experimental system,which can effectively support the distributed simulation of large-scale quantum cryptography communication network.In the end,we summarize the work done and propose directions and recommendations for the future work.