A fiber-based quasi-continuous-wave quantum key distribution system

作者：Shen, Yong; Chen, Yan; Zou, Hongxin^*; Yuan, Jianmin

来源：Scientific Reports, 2014, 4(1): 4563.

DOI：10.1038/srep04563

• GAUSSIAN ATTACKS
• OPTIMALITY
• SECURITY

We report a fiber-based quasi-continuous-wave (CW) quantum key distribution (QKD) system with continuous variables (CV). This system employs coherent light pulses and time multiplexing to maximally reduce cross talk in the fiber. No-switching detection scheme is adopted to optimize the repetition rate. Information is encoded on the sideband of the pulsed coherent light to fully exploit the continuous wave nature of laser field. With this configuration, high secret key rate can be achieved. For the 50 MHz detected bandwidth in our experiment, when the multidimensional reconciliation protocol is applied, a secret key rate of 187 kb/s can be achieved over 50 km of optical fiber against collective attacks, which have been shown to be asymptotically optimal. Moreover, recently studied loopholes have been fixed in our system.

• 出版日期2014-4-2
• 单位中国人民解放军国防科学技术大学