论文标题
高弹性自由空间量子通信的非本地时间干涉率
Non-local temporal interferometry for highly resilient free-space quantum communication
论文作者
论文摘要
长距离通过光子通过光子的纠缠分布可以实现许多应用程序，包括量子密钥分布（QKD），该应用程序提供了前所未有的隐私。在长距离上积累的噪声不可避免的纠缠不可避免的退化仍然是该领域的主要挑战之一。利用高维纠缠光子的潜力有望应对这一挑战，但对实验实施提出了极大的要求。在这里，我们提出了一个州际自由空间量子链接，分布超过$ 10.2 \，$ km，通过部署相位稳定的非本地弗兰森干涉仪的柔性维度的超过$ km，具有灵活的尺寸。随着多维能量纠缠光子的这种分布，我们在尺寸适应性的QKD方案中分析了可实现的关键率，该QKD方案可以相对于任何环境噪声条件进行优化。我们的方法可以使并强调高维纠缠在量子通信方面的力量，从而在一天黎明之前就产生了正渐近的关键率。
Entanglement distribution via photons over long distances enables many applications, including quantum key distribution (QKD), which provides unprecedented privacy. The inevitable degradation of entanglement through noise accumulated over long distances remains one of the key challenges in this area. Exploiting the potential of higher-dimensional entangled photons promises to address this challenge, but poses extreme demands on the experimental implementation. Here, we present an interstate free-space quantum link, distributing hyper-entanglement over $10.2\,$km with flexible dimensionality of encoding by deploying a phase-stable non-local Franson interferometer. With this distribution of multidimensional energy-time entangled photons, we analyse the achievable key rate in a dimensionally-adaptive QKD protocol that can be optimized with respect to any environmental noise conditions. Our approach enables and emphasises the power of high-dimensional entanglement for quantum communication, yielding a positive asymptotic key rate well into the dawn of the day.
