Feasibility study of handheld Quantum Key Distribution

量子密钥分发（QKD）是一种提供前所未有的数据安全性的加密方案。我们的项目旨在开发QKD在保护终端（如ATM）和手持设备（例如移动的电话）之间的短距离无线通信中的实际应用。我们的财团，诺基亚研发（英国）有限公司，Alpha Contract Engineering（ACE）和牛津大学已经确定了商业化的3个主要障碍，即缺乏低成本的光学无线转向技术，量子接收器的昂贵和笨重的光学组件，以及缺乏CMOS平台上可大规模制造的单光子探测器（SPD）阵列。将开发一种快速精确的光学转向设备（牛津大学），将单光子从手持设备引导到量子接收器。QKD终端将使用简化和简化的光学组件（ACE，诺基亚）制造。将研究可扩展CMOS平台上SPD阵列的性能（牛津大学）。最后，将展示一个原型无线量子链路。

Quantum key distribution (QKD) is a cryptographic scheme which provides an unprecedented level of data security. Our project seeks to develop practical applications of QKD in securing short-range wireless communications between a terminal such as an ATM and a handheld device (e.g. mobile phone). Our consortium, Nokia R&D (UK) Ltd, Alpha Contract Engineering (ACE) and University of Oxford have identified the 3 main barriers to commercialisation, namely, the lack of low-cost optical wireless steering techniques, expensive and bulky optical assembly for quantum receivers and the lack of mass-manufacturable single photon detector (SPD) arrays on CMOS platform. A fast and precise optical steering device (University of Oxford) that directs single photons from a handheld device to a quantum receiver will be developed. QKD terminals will be fabricated using miniaturised and simplified optical assemblies (ACE, Nokia). Performances of SPD arrays on scalable CMOS platform will be studied (University of Oxford). Finally, a prototype wireless quantum link will be demonstrated.