One-decoy-state quantum key distribution with advantage distillation based on planar-lightwave-circuit-integration modules

作     者：Jiali Zhu Xingyu Zhou Huajian Ding Jingyang Liu Chunhui Zhang Jian Li Junming An Qin Wang 

作者机构：Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Laboratory of Optoelectronic Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China 

出 版 物：《Physical Review A》 (Phys. Rev. A)

年 卷 期：2025年第111卷第1期

页      面：012608-012608页

核心收录：

基　　金：National Natural Science Foundation of China, NSFC, (62101285, 62471248, 12074194, 12104240) National Natural Science Foundation of China, NSFC Innovation Program for Quantum Science and Technology, (2021ZD0300701) Natural Science Foundation of Jiangsu Province, (BK20192001, BE2022071) Natural Science Foundation of Jiangsu Province Postgraduate Research & Practice Innovation Program of Jiangsu Province, (KYCX23_1040) 

主　　题：Mach Zehnder interferometers 

摘      要：Photonics integrated circuits provide a stable, compact and robust platform for the implementation of quantum key distribution (QKD), which can generate information-theoretic secure keys between distant parties. Here, we present a high-speed QKD tests with silica planar lightwave circuits based asymmetric Mach-Zehnder interferometer modules. To further enhance system performance and reduce system complexity, we employ the advantage distillation (AD) algorithm alongside the one-decoy method. The AD algorithm can effectively extract strongly correlated bit pairs from weakly correlated bit pairs, thereby significantly improving the key rate over long distances, where traditional post-processing methods fail to generate keys. With a clock rate of 625 MHz, our system achieves composable secret key rates of 3.32 Mbps at 2 dB loss and 1.85 kbps at 18 dB loss, respectively. These results represent the first experimental validation of AD algorithm, and pave the way for the development of QKD networks with photonic integration.