Research Of Software Control In Quantum Key Distribution System

This paper mainly introduces the research on software control part in the quantum key distribution system,and the simulation of multiple parameters of decoy protocol over the past two years in Beijing University of Posts and Telecommunications.The goal of the software control section is to promote the automation construction of the communication platform,which means shortening the necessary and repeatable platform construction through self scanning process.The article focuses on the research on the realization of the self scanning process.The simulation of multiple parameters allows us to determine the key factors that affect the key generation rate in the case of multiple parameters.At the beginning of the article,we elaborated the development history and related current situation of the whole field of quantum communication,and made a brief introduction to some communication protocols also the basic knowledge of quantum theory.The following two chapters focus on the work that has been done for more than two years in the quantum communications laboratory.The third chapters mainly introduces the design idea of the whole experiment platform to realize the phase self scanning process.MFC is responsible for the interaction and the main logic of the system.Lab View is responsible for controlling the single photon detector,and feedback the detected results back to the MFC port.FPGA is responsible for controlling the crucial phase modulator in the experimental optical path.The three collaborate and cooperate to complete the self scanning process.We also use the mark point and the pruning method to optimize the self scanning results.The final conclusion proves the stability of the system.The fourth chapters introduces the simulation work of the decoy state MDI-QKD.Because previous simulations only aim at the research of key generation rate or bit error rate in one certain aspect,there is no direct reflection of the relationship between multiple variables.Through our simulation,we can see that the increase of the Z base and the increase of the ratio of the signal state to the decoy state will increase the key generation rate.