Platform Development for Diamond Quantum and Photonic Technologies

光学初始化、操纵和读出缺陷的自旋状态的能力（例如，带负电荷的氮空位）支撑了一系列量子技术（例如，基于钻石中的自旋量子位的紧凑的、可扩展的量子处理器，其可以连接到经典计算机）。金刚石合成、加工和纳米/微米尺度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。要取得进一步的重大进展，需要对功能性色心进行精确的纳米级定位，而且重要的是，需要在器件加工方面取得进展，以减少体部和表面上的缺陷，这些缺陷目前将性能限制在远低于可能的水平。通过将对缺陷物理学的理解与一系列处理方法相结合以常规地生产厚度<500 nm的金刚石膜，含有量子特性接近体材料的色心阵列。功能缺陷写入将通过混合方法实现。生长过程中的掺杂促进了1D掺杂剂局部化，离子注入+退火将用于共掺杂和缺陷电荷状态稳定，并且局部空位和功能缺陷的产生将使用电子辐照（在透射电子显微镜中）和fs激光处理来实现。1金刚石膜将使用最近从Warwick转移到Element Six Ltd的剥离工艺来制造。2

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