论文标题
量子密钥分布的长距离传输与弱耦合的几种模式光纤共存的经典光学通信
Long-distance transmission of quantum key distribution coexisting with classical optical communication over weakly-coupled few-mode fiber
论文作者
论文摘要
量子密钥分布（QKD）是量子信息处理中最实际的应用程序之一，可以在远程各方之间生成信息理论的安全键。借助波长划分多路复用技术，QKD已与经典的光学通信网络集成在一起。波长划分的多路复用可以通过使用较少模式纤维（FMF）的模式波长双重多路复用技术进一步改进，该技术具有额外的模态隔离和较大的模式有效核心区域，尤其是与多核纤维相比的制造和拼接技术。在这里，我们首次使用全纤维模式选择性耦合器在弱耦合的FMF上与经典的光学通信共存。 QKD与一个100 Gbps的经典数据通道的共同传播在-2.60 dbm发射的功率达到了86 km FMF，并具有1.3 kbps实时安全钥匙生成。与单模光纤相比，在相同的纤维输入功率下，FMF中的平均拉曼噪声降低了86％。我们的工作实现了QKD与经典光学通信之间集成的重要方法，并预览了量子通信与下一代模式分层多路复用网络的兼容性
Quantum key distribution (QKD) is one of the most practical applications in quantum information processing, which can generate information-theoretical secure keys between remote parties. With the help of the wavelength-division multiplexing technique, QKD has been integrated with the classical optical communication networks. The wavelength-division multiplexing can be further improved by the mode-wavelength dual multiplexing technique with few-mode fiber (FMF), which has additional modal isolation and large effective core area of mode, and particularly is practical in fabrication and splicing technology compared with the multi-core fiber. Here, we present for the first time a QKD implementation coexisting with classical optical communication over weakly-coupled FMF using all-fiber mode-selective couplers. The co-propagation of QKD with one 100 Gbps classical data channel at -2.60 dBm launched power is achieved over 86 km FMF with 1.3 kbps real-time secure key generation. Compared with single-mode fiber, the average Raman noise in FMF is reduced by 86% at the same fiber-input power. Our work implements an important approach to the integration between QKD and classical optical communication and previews the compatibility of quantum communications with the next-generation mode division multiplexing networks
