Integration, development and deployment of spatially multiplexed single photon sources

项目描述：在创建空间复用单光子源时，低干扰和组件的高效集成对于在低温环境下提供前馈至关重要。实现这种设备的用例是近期应用的关键。该项目将分为两个主要目标：系统级集成和硬件组件设计，以及理论化高效单光子源的新用例。硬件级方法妥协于设计和开发集成子系统的方法，以创建单个光子源，即芯片之间的封装技术（光子源和snspd），与低温集成，组件之间的光学接口。这包括将现有文献应用于使用集成微电子和倒装芯片键合探测器构建在SoI上的器件。优化系统组件的途径包括研究创建低损耗芯片延迟线和低温调制方案的新方法。不确定这个范围对于博士课程来说是否太大。这些组件可以用来限定和优化光源亮度和保真度。这种多路复用源的理论用例包括查看创建钟对（最终是GHZ状态）的目标保真度和效率界限，以及将多路复用源用于量子通信协议（即纠缠交换和量子中继器）的可行性。这项工作将在大光子组内进行，与Seb Currie， Dom Sulway和Jeremy Adcock一起工作。该小组拥有未来两年的资金，现有设备包括2um激光器和宽带源，OSA，单光子SNSPD，芯片平台，用于低温集成的冰箱（目前正在建造中），以及未来SoI芯片运行的资金。Qcomms小组将在生成理论用例方面进行协作

Project Description: When creating a spatially multiplexed single photon source, low interference and high efficiency integration of components is critical to provide feedforward in low temperature environments. Realising the use-cases of such a device is key for near-term applications. This project will be split into two main goals: systems level integration and hardware component design, and theorising novel use-cases of high efficiency single photon sources. The hardware level approach compromises of designing and developing ways of integrating subsystems to create a single photon source i.e. packaging techniques between chips(photon sources andSNSPD's),integration with cryogenics, optical interfaces between components. This comprises of applying existing literature toa device built on SoI using integrated microelectronics and flip chip bonded detectors. Avenues for optimising system components include investigating novel methods of creating low-losson chip delay lines and low temperature modulation schemes. Unsure whether this scope is too large for duration of the PhD. These components can then be used to qualify and optimise source brightness and fidelity. The theoretical use-cases of such a multiplexed source comprises of looking at target fidelity and efficiency bounds for creating bell pairs(and eventually GHZ states),and the feasibility of using for multiplexed sources for quantum communication protocols -i.e. entanglement swapping and quantum repeaters. The work will be performed within the big photon group, working alongside Seb Currie, Dom Sulway and Jeremy Adcock. The group has funding for a further two years, with existing equipment consisting of 2um lasers and broadband sources, OSA, single photon SNSPD's, chip rigs, a fridge for cryogenic integration (currently being built), and funding for future SoI chip runs. There will be collaboration will the Qcomms's group in generating theoretical use-cases