【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.更多还原

【Abstract】 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.更多还原