Feasibility study for 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。这可以用来防止数据泄露，如ATM“撇脂”攻击。我们的项目旨在开发QKD的实际应用，以确保终端（如ATM）和手持设备（如移动电话）之间的短距离无线通信。我们的联盟，诺基亚研发英国有限公司，阿尔法合同工程公司（ACE）和牛津大学已经确定了商业化的三个主要障碍，即缺乏低成本的光学无线转向技术，量子接收器复杂光学组件的高成本障碍以及CMOS平台上缺乏可批量生产的单光子探测器（SPD）阵列。一种快速而精确的光学导向装置（牛津大学）将被开发出来，它可以将单个光子从手持设备引导到量子接收器上。将对单个系统组件进行测试。特别是，使用现有英国制造能力的小型化和简化光学组件将被研究、制造和测试用于QKD使用（ACE）。可扩展CMOS平台上SPD阵列的关键参数将被测量（牛津大学），并用于详细的仿真和建模，以选择最适合的转向方法。最后，将建立一个原型无线量子链路（诺基亚和牛津大学），简化光学（ACE），以证明安全量子无线交易的可行性。

Quantum key distribution (QKD) is a cryptographic scheme which provides an unprecedented level of data security. Thiscan be used to prevent data breaches such as ATM 'Skimming' attacks. Our project seeks to develop practical applicationof QKD in securing short-range wireless communication 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 haveidentified the 3 main barriers to commercialisation, namely, the lack of low-cost optical wireless steering techniques, highcost barrier to complex 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 singlephotons from a handheld device to a quantum receiver will be developed. Testing of individual system components will becarried out. In particular, miniaturised and simplified optical assemblies using existing UK manufacturing capability will beresearched, built and tested for QKD use (ACE). Critical parameters of SPD arrays on scalable CMOS platform will bemeasured (University of Oxford) and used in detailed simulation and modelling to select the best suited steering method.Finally, a prototype wireless quantum link will be built (Nokia & University of Oxford) with simplified optics (ACE) todemonstrate the feasibility of secure quantum wireless transactions.