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 wave-length division multiplexer[DWDM]to achieve multi-user QKD.We experimentally test the encoding module with a rep-etition 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.

Yi Zhang;Xiaojuan Qin;Jindong Wang;Yafei Yu;Zhengjun Wei;Zhiming Zhang

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

中国光学快报（英文版）

[1]Yi Zhang;Xiaojuan Qin;Jindong Wang;Yafei Yu;Zhengjun Wei;Zhiming Zhang-.Phase modulation polarization encoding module applied to one-to-many QKD network based on wavelength division multiplexing)[J].中国光学快报（英文版）,2022(12):56-61

etition,QBER

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