标题： 基于弱耦合少模光纤的量子密钥分发与经典光通信共存的远距离传输 显示英文标题

标题： Long-distance transmission of quantum key distribution coexisting with classical optical communication over weakly-coupled few-mode fiber

摘要： 量子密钥分发（QKD）是量子信息处理中最实用的应用之一，可以在远程各方之间生成信息理论安全的密钥。 在波分复用技术的帮助下，QKD已经与经典光通信网络集成。 通过使用少模光纤（FMF）的模式-波长双复用技术，可以进一步改进波分复用，该技术具有额外的模态隔离和大的有效核心面积，并且与多芯光纤相比，在制造和熔接技术方面更为实用。 在这里，我们首次提出了一种在弱耦合FMF上与经典光通信共存的QKD实现，使用了全光纤模式选择耦合器。 在-2.60 dBm发射功率下，QKD与一个100 Gbps的经典数据信道共传输，实现了86 km FMF上的1.3 kbps实时安全密钥生成。 与单模光纤相比，在相同的光纤输入功率下，FMF中的平均拉曼噪声减少了86%。 我们的工作实现了QKD与经典光通信集成的重要方法，并预示了量子通信与下一代模式复用网络的兼容性。 显示英文摘要

摘要： 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