针对光纤量子密钥分发(QKD)系统中信号同步的关键问题,提出了一种光同步方案.发送方通过现场可编程门阵列(FPGA)产生一定特征的同步脉冲序列驱动同步激光器,产生的同步光和信号光耦合到一根光纤传给接收方.接收方对同步光进行高速甄别,甄别出的同步脉冲经过高精度延时调整后作为门控信号提供给单光子探测器;同时在FPGA内使用高频时钟采样同步脉冲序列用以编码,使得双方达到严格同步.该方案具有高精度、低成本、容错性好的特点,已经成功应用于城域量子通信网络.
参考文献
| [1] | Shor P W,Preskill J.Simple proof of security of the BB84 quantum key distribution protocol[J].Phys.Rev.Lett.,2000,85:441-444. |
| [2] | Bennett C H,Brassard G.Quantum cryptography:public key distribution and coin tossing[C].Proceedings of theIEEE International Conference on Computers,Systems,and Signal Processing,New York:IEEE,1984,175-179. |
| [3] | Hwang W Y.Quantum key distribution with high loss:toward global secure communication[J].Phys.Rev.Lett.,2003,91:057901. |
| [4] | Liang Chuang,Fu Donghao,Liang Bing,et al.Quantum key distribution over 1.1 km in an 850 nm experimental all-fiber system[J].Acta Physica Sinica (物理学报),2001,50(08):1429-1433 (in Chinese). |
| [5] | Zhang Bing,Tang Zhilie,Liang Ruisheng,et al.Experimental research of quantum key distribution with four polarization states coding and decoding[J].Chinese Journal of Quantum Electronics (量子电子学报),2008,06:713-718 (in Chinese). |
| [6] | Mo Xiaofan,Zhu Bing,Han Zhengfu,et al.Faraday-Michelson system for quantum cryptography[J].Opt.Lett.,2005,30:2632. |
| [7] | Rosenberg D,Nam S W,Hiskett P A,et al.Quantum key distribution at telecom wavelengths with noise-free detectors[J].Appl.Phys.Lett.,2006,88:021108. |
| [8] | Wang Jian,Zhang Hongfei,Wan Xu,et al.Design of FPGA and USB based control board for quantum experiments[J].Chinese Journal of Quantum Electronics (量子电子学报),2010,27(1):77-81 (in Chinese). |
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