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.

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):122701

QBER

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