基于中红外与通信波段双色纠缠源的量子密钥分发
Quantum key distribution based on mid-infrared and telecom band two-color entanglement source
AI总结：
针对现有星载自由空间QKD受太阳背景噪声限制仅能夜间运行的问题，制备了中红外与通信波段双色偏振纠缠光子源，验证了混合信道QKD原理，理论上可实现超500km自由空间加96km光纤的长距离传输，为全天时全球量子网络奠定基础。
摘要：
由于太阳背景辐射带来的高噪声，现有星载自由空间量子密钥分发（QKD）实验主要在夜间开展，阻碍了实用化全天时实时全球尺度量子网络的构建。鉴于3-5μm中红外（MIR）波段太阳背景辐射极低且抗散射能力强，是自由空间量子通信的理想波段之一。本文首先报道了高质量中红外（3370 nm）与通信波段（1555 nm）双色偏振纠缠光子源的制备，随后利用该光源在实验室中实现了基于自由空间与光纤混合信道的QKD原理验证实验。理论分析明确表明，该方案可同时实现500 km自由空间与96 km光纤混合信道的长距离QKD。这项工作为发展全天时全球尺度量子通信网络迈出了重要一步。
英文摘要：
Due to the high noise caused by solar background radiation, the existing satellite-based free-space quantum key distribution (QKD) experiments are mainly carried out at night, hindering the establishment of a practical all-day real-time global-scale quantum network. Given that the 3-5 μm mid-infrared (MIR) band has extremely low solar background radiation and strong scattering resistance, it is one of the ideal bands for free-space quantum communication. Here, firstly, we report on the preparation of a high-quality MIR (3370 nm) and telecom band (1555 nm) two-color polarization-entangled photon source, then we use this source to realize a principle QKD based on free-space and fiber hybrid channels in a laboratory. The theoretical analysis clearly shows that a long-distance QKD over 500 km of free-space and 96 km of fiber hybrid channels can be reached simultaneously. This work represents a significant step toward developing all-day global-scale quantum communication networks.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
