论文标题
带有量子点源的日光基于纠缠的量子键分布
Daylight entanglement-based quantum key distribution with a quantum dot source
论文作者
论文摘要
基于纠缠的量子密钥分布可以使可信赖的无节点网络和长距离的安全通信。尽管在纤维和自由空间中都存在实施，但由于环境因素，后一种方法通常被认为是具有挑战性的。在这里，我们使用量子点源首次在白天实施量子通信协议。这项技术在较窄的光谱带宽方面具有优势 - 有益于滤除阳光 - 以及在峰值亮度时可忽略不计的多光子发射。在不同的光线和天气条件下，我们展示了三天半的时间内的连续运行，跨越了270米长的自由空间光学连接。
Entanglement-based quantum key distribution can enable secure communication in trusted node-free networks and over long distances. Although implementations exist both in fiber and in free space, the latter approach is often considered challenging due to environmental factors. Here, we implement a quantum communication protocol during daytime for the first time using a quantum dot source. This technology presents advantages in terms of narrower spectral bandwidth -- beneficial for filtering out sunlight -- and negligible multiphoton emission at peak brightness. We demonstrate continuous operation over the course of three and a half days, across an urban 270-m-long free-space optical link, under different light and weather conditions.
