Development Of Trng For Quantum Key Communication

With the rapid development of quantum communication research in China,the quantum key communication has been applied to practice and breakthroughs have been made.The success of the QUESS(Quantum Experiments at Space Scale)satellite has demonstrated China's capability that can combine the quantum and space communication channels to achieve a long-distance,multidimensional and full-time wide range quantum key communication network.Real random number has been used as the data source of the original key in the quantum key communication experiment.Since the rate of communication at the communication terminal will degrade due to the degradation in the source,channel and destination,a high rate of signal generation is mandatory for the data source.This is especially true in the case of the long-distance and high-noise environment in the full-time free space quantum communication.The rate of random number generation is required to reach 1Gbps.This thesis aims to design a real random number generator which satisfies the high data rate requirement of the quantum key communication in the free space.The data source can achieve a data rate as high as 960 Mbps.This data source can meet the requirement of quantum communication and can effectively boost the building of a wide range quantum key communication network.Firstly,this thesis uses a modular approach to draw an overall design scheme based on the functional and performance requirement of a real random number generator.Hardware and FPGA logic design are carried out in parallel and every module is built on smaller ones.Secondly,the thesis introduces the designs of the important sub modules in detail.The hardware module includes FPGA module,real random number generator module and data storage module.The FPGA logic module comprises of control instruction processing module,NAND FLASH controller and a high speed serial communication module.Finally,the thesis introduces the FPGA logic and true random number generator function and performance of the whole verification respectively,and the validation results show that the functions and performance of the real random number generator meet the technical requirements of practical application.The data rate of the real random number generator designed can reach 960 Mbps,which meets the experiment requirements of the quantum key communication in free space.And the design scheme in this thesis can serve as a guideline and reference for engineers with similar technical tasks in the future.