摘要
The quantum key distribution(QKD)network is a promising solution for secure communications.In this paper,we proposed a polarization-independent phase-modulated polarization encoding module,and it can be combined with a dense wavelength division multiplexer(DWDM)to achieve multi-user QKD.We experimentally test the encoding module with a repetition rate of 62.5 MHz,and its average quantum bit error rate(QBER)is as low as 0.4%.Finally,we implement a principle verification test for simultaneous QKD for 1 to 2 users in 100 min,and the average QBER of two users under the transmission distance of 1 km and 5 km is kept below 0.8%.Due to the use of polarization encoding,the module can also realize scalable network architecture in free-space QKD systems in the future.
作者
Yi Zhang
Xiaojuan Qin
Jindong Wang
Yafei Yu
Zhengjun Wei
Zhiming Zhang
张毅;秦晓娟;王金东;於亚飞;魏正军;张智明(Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,School of Information and Optoelectronic Science and Engineering,South China Normal University,Guangzhou 510006,China;Guangdong Polytechnic Institute,Guangzhou 510091,China)
基金
supported by the National Natural Science Foundation of China(Nos.61771205 and 62071186)
Natural Science Foundation of Guangdong Province(No.2015A030313388)
Science and Technology Planning Project of Guangdong Province(Nos.2015B010128012 and 2017KZ010101)
Key Laboratory Foundation of Guangdong Province,China(No.2020B1212060066)。
