基于相位调制偏振态QKD系统的量子信道校正发送方案  

Study on Sending after Verify Scheme in Quantum Channel for Quantum Key Distribution System Based on Polarization Coding

作　　者：魏亚东[1,2] 唐志列[1] 刘小宝[1] 廖常俊[3] 刘颂豪[3] 

机构地区：[1]华南师范大学物理与电信工程学院 [2]东莞理工学院电子信息工程学院,广东东莞523808 [3]华南师范大学信息光电子科技学院,广州510631

出　　处：《光子学报》2009年第7期1852-1857,共6页Acta Photonica Sinica

基　　金：国家"973"计划项目(2001CB309300);广州市项目(19992022035201);东莞市科技计划(2007108101013)资助

摘　　要：提出了一种基于相位调制偏振态QKD系统的量子信道校正发送的新方案—采用波导型相位调制器研制成电控连续可调光学相移器,它可随相位调制器输入电压的连续改变而产生连续的相移,从而控制输出的偏振态;在其前放置一个半波片,即可校正接收端偏振态量子态在信道中所发生的改变,从而保证信道传送密钥的可用性.通过理论推导和实验研究验证了基于相位调制偏振态QKD系统的量子信道校正发送方案的核心部件的可行性.由于本方案能实现高速调制(GHz),为解决光纤传输的偏振编码QKD系统中偏振态漂移问题提供了一种新的途径.A new sending after verify scheme, which was employed to solve the polarization fluctuation in quantum channel for QKD implementation based on polarization coding, was proposed in this paper. According this scheme, an optical phase shifter driven by voltage was developed. By altering the input voltage of phase modulator, the optical phase shifter can produce arbitrary polarization states. With the optical phase shifter and a half-wave plate, the polarization states of a QKD system can be resumed to Alice＇s original state discretionarily at Bob, it confirm the quantum channel is usable for QKD. The feasibility of the kernel part of the sending after verifying scheme in quantum channel for quantum key distribution system was validated in theory and practice. Because of the high modulation speed （GHz） in waveguide phase-modulators,the new scheme can help settling the polarization fluctuation in fiber-based QKD systems.

关 键 词：量子密钥分配(QKD) 量子信息 偏振编码 量子光学 量子信道校正 

分 类 号：TN918[电子电信—通信与信息系统]