The Research Of Reconciliation In Continuous Variable Quantum Key Distribution Based On FPGA

Since quantum no-cloning and the Heisenberg uncertainty relation ensure the absolute security and the ability of detecting eavesdropper, quantum cryptography has become the most attractive frontiers in recent years. Quantum Key Distribution (QKD), as the most emphasized research field, has bred remarkable fruition both theatrically and experimentally. After continuous exploitation, scholars found that the technology of photon generation and detection, which the discrete variable quantum key distribution relies on, limited the speed of communication, while at the same time, continuous quantum key distribution which uses coherent light is much easier to realize, and its high speed of communication has been experimentally proved. Therefore, continuous quantum key distribution attracts more and more attention.In order to provide control function for quantum communication, some electrical solution has already been proposed and many of them have been experimentally realized. However, these solutions could not satisfy system demands on precision and function in present communication schemes. Besides, with the fast development of embedded technology and programming techniques, people are looking for a more universal and powerful solution, with more precise timing and powerful software processing ability, greater portability and convenience to reuse all the resources, higher integration of software and hardware and also the ability to work without a PC.For the purpose of realizing a reusable electrical solution with powerful software processing ability and higher integration intensity, this thesis, based on Xilinx FPGA platform, realizes a synchronous timing IP core with precise clock output for the continuous variable quantum key distribution scheme using SOPC techniques. The ML405 based Linux porting is also accomplished and the seamless integration of software and hardware is realized, providing a user-friendly and convenient development environment for the following realization of reconciliation and other QKD related algorithms. Finally, the thesis finishes the programming of auto-adaptive interval selection algorithm for continuous quantum key distribution under embedded Linux. After analyzing a large amount of data experimentally, the validity of the algorithm is proved.