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Strategies for achieving high key rates in satellite-based QKD

机译：实现基于卫星QKD的高调率的策略

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Quantum key distribution (QKD) is a pioneering quantum technology on the brink of widespread deployment. Nevertheless, the distribution of secret keys beyond a few 100 km at practical rates remains a major challenge. One approach to circumvent lossy terrestrial transmission of entangled photon pairs is the deployment of optical satellite links. Optimizing these non-static quantum links to yield the highest possible key rate is essential for their successful operation. We therefore developed a high-brightness polarization-entangled photon pair source and a receiver module with a fast steering mirror capable of satellite tracking. We employed this state-of-the-art hardware to distribute photons over a terrestrial free-space link with a distance of 143 km, and extracted secure key rates up to 300 bits per second. Contrary to fiber-based links, the channel loss in satellite downlinks is time-varying and the link time is limited to a few minutes. We therefore propose a model-based optimization of link parameters based on current channel and receiver conditions. This model and our field test will prove helpful in the design and operation of future satellite missions and advance the distribution of secret keys at high rates on a global scale.
机译：量子密钥分布（QKD）是广泛部署边缘的开创性量子技术。尽管如此，秘密钥匙的分布在实际率超过100公里处仍然是一个重大挑战。缠绕光子对的绕过液体传输的一种方法是光学卫星链路的部署。优化这些非静态量子链路以产生最高可能的钥匙率对于它们的成功操作至关重要。因此，我们开发了一种高亮度极化缠结的光子对源和具有能够卫星跟踪的快速转向镜的接收器模块。我们采用了这种最先进的硬件来分配光子，将光子分布在一个距离与距离为143公里的地面自由空间链路上，并从每秒提取最多300位的安全键速率。与基于纤维的链路相反，卫星下行链路中的信道损耗是时变的，链路时间限制为几分钟。因此，我们提出了基于当前通道和接收器条件的基于模型的链路参数优化。该型号和我们的实地考验将有助于未来卫星任务的设计和运营，并在全球范围内以高利率推进秘密密钥的分布。

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