Platform Development for Diamond Quantum and Photonic Technologies

金刚石中光学初始化、操纵和读出缺陷（例如带负电荷的氮空位）自旋状态的能力支撑了一系列量子技术（例如，基于金刚石中自旋量子位的紧凑、可扩展的量子处理器，可以连接到经典计算机）。金刚石合成、加工和纳米/微米级器件制造的最新进展已经证明了增加光-物质相互作用和金刚石光子器件性能的潜力。进一步的重大进展需要对功能色中心进行精确的纳米级定位，以及在设备加工方面的重要发展，以减少体积和表面上的缺陷，这些缺陷目前限制了性能远远低于可能的水平。该项目专注于开发量子金刚石平台，通过将对缺陷物理的理解与一系列加工方法相结合，常规生产厚度<500纳米的金刚石膜，其中包含具有接近体的量子特性的色心阵列。功能性缺陷的编写将通过混合方法来实现。生长过程中掺杂有利于一维掺杂的局域化，离子注入+退火将用于共掺杂和缺陷电荷态的稳定，并将使用电子辐照（在透射电子显微镜下）和fs激光加工实现局域空位和功能缺陷的产生金刚石膜的制造将采用最近从沃里克转移到Element Six Ltd的升降工艺

The ability to optically initialise, manipulate and readout the spin state of defects (e.g., negatively charged nitrogen vacancy) in diamond underpins a range of quantum technologies (e.g., compact, scalable quantum processor based on spin qubits in diamond that can be connected to classical computers). Recent advances in diamond synthesis, processing and fabrication of nano/micron scale devices have demonstrated the potential to increase light-matter interaction and the performance of diamond photonic devices. Significant further progress requires accurate nano-scale positioning of the functional colour centres, and importantly development in device processing to reduce the defects in the bulk and on the surface that today limit the performance to well below that which is possible.This project focuses on developing the quantum diamond platform, through combining understanding of defect physics with a range of processing methodologies to routinely produce diamond membranes with thicknesses <500 nm, containing arrays of colour centres with quantum properties approaching those of the bulk. The functional defect writing will be achieved through a hybrid approach. doping during growth facilitates 1D dopant localisation, ion implantation + annealing will be used for co-doping and defect charge state stabilisation, and localised vacancy and functional defect production will be achieved using electron irradiation (in a Transmission Electron Microscope) and fs-laser processing.1 The diamond membranes will be fabricated using a lift-off process recently transferred to Element Six Ltd from Warwick.2