Towards scaleable qubits using diamond nitrogen vacancy centres

该项目涉及将单晶膜中的钻石色心耦合到光学微腔，以在相干自旋态和光学网络之间建立有效的接口。工作重点是使用离子注入和激光写入技术制造的氮空位中心。学生将解决的关键新问题是：1)开放腔耦合可以在多大程度上增强从单个NV中心到光网络的相干光子的耦合，考虑到NV中心的永久偶极子对钻石膜厚度的限制？2)自适应光学可以在多大程度上改善光进入开放腔的耦合？3)能否开发预对准模块来消除低温环境中不需要的自由度，并允许同时与NV中心阵列耦合？项目的第一年包括设置自适应光学系统和解决问题2。第二年将集中在问题1和第三年的问题3上。学生可以充分使用专用的定制光学显微镜，该项目与EPSRC资助的工作密切相关，与华威大学、剑桥大学和斯特拉斯克莱德大学的研究人员合作，为基于网络的量子计算机开发钻石节点。EPSRC主题：量子技术、制造未来、物理科学、信息和通信技术。

This project involves coupling diamond colour centres in single crystal membranes to optical microcavities to build efficient interfaces between coherent spin states and an optical network. Work focuses on nitrogen-vacancy centres fabricated using both ion implantation and laser writing techniques. Key novel questions that the student will address are:1) To what extent can open cavity coupling enhance the coupling of coherent photons from a single NV centre to an optical network, given the restrictions placed on diamond membrane thickness by the permanent dipole of the NV centre?2) To what extent can adaptive optics be used to improve the coupling of light into an open cavity?3) Can a pre-aligned module be developed to eliminate unwanted degrees of freedom in the cryogenic environment and allow simultaneous coupling with an array of NV centres?Year 1 of the project consists of setting up adaptive optics and addressing question 2. Year 2 will be focused on question 1 and year 3 on question 3. The student has full use of a dedicated custom-built optical microscope, complete with laser system and cryogenics.The project interfaces closely with our EPSRC-funded work to develop diamond nodes for network-based quantum computers, in collaboration with researchers at the Universities of Warwick, Cambridge and Strathclyde. EPSRC Themes: Quantum Technologies, Manufacturing the Future, Physical Sciences, ICT.