Dou Tianqi, Gao Song, Zhang Chengliang, Tong Jiangang, Liu Rende, Shen Lei, Li Juhao, Pan Zhengjun, Liao Min, Tang Jianjun, Tang Shibiao
Opt Lett. 2023 Sep 15;48(18):4905-4908. doi: 10.1364/OL.500406.
The integration of quantum key distribution (QKD) and classical optical communication has attracted widespread attention. In this Letter, we experimentally demonstrate a real-time co-propagation of 1 Tbps for 10 classical channels with one discrete-variable QKD channel in the weakly coupled few-mode fiber (FMF). Based on the selection of optimal device parameters and wavelength assignment of classical channels, as well as the optimization of equipment performance, a secure key rate of as high as 2.7 kbps of coexistence transmission of QKD and classical optical communication can be achieved using a 100.96 km weakly coupled FMF. Therefore, this study is a step toward realizing long-distance quantum-classical coexistence transmission.
量子密钥分发（QKD）与经典光通信的融合已引起广泛关注。在本信函中，我们通过实验证明了在弱耦合少模光纤（FMF）中，1个离散变量QKD信道与10个经典信道可实现1 Tbps的实时共传播。基于经典信道的最佳器件参数选择和波长分配，以及设备性能的优化，使用100.96 km的弱耦合FMF可实现QKD与经典光通信共存传输时高达2.7 kbps的安全密钥率。因此，本研究朝着实现长距离量子-经典共存传输迈出了一步。
