Research On And Implementation Of Polarization Encoded Quanum Key Distribution System Based On B92Protocol

Quantum cryptography communication is based on the foundation of classicalcommunication and quantum mechanics, which is a multi-disciplinary convergenceresearch area. As the superiority of unconditional safety, it becomes a new securecommunication technology. Quantum communication based on quantum keydistribution (QKD) will be applied commercially firstly. In this dissertation, weresearch on the implementation of the quantum cryptography communication systembased on B92protocol, and mainly focus on the realization of quantum key distributionsystem with polarization encoding.Firstly, we briefly introduce the concept, background, progress and some relatedtechnologies of quantum key distribution。The basic theory of polarization optics andpolarization control are also discussed. In the theoretical study of polarization, a kindof polarization control model and algorithm of quantum key distribution system isgiven.Secondly, an experiment system based on polarization-encoding and B92scheme is built. Thirdly the overall design scheme of the system is given, the sender,receiver, and synchronization system are designed and implemented. It is proved thatthe performance of the system is improved significantly, because of application of thepolarization auto-feedback control algorithm. Finally, we review the paper and givesome suggestion for the next research.