基于金刚石氮空位中心自旋的高压下原位磁性表征

金刚石氮空位中心是实现量子信息处理和量子计算的优良载体，氮空位中心在室温下可以用光学和微波脉冲实现初始化、操控以及读出电子自旋态，金刚石具有天然耐高压的特性，同时其电子自旋又是高灵敏度的磁场探针，因此基于氮空位中心的自旋量子传感方案非常适合集成于原位高压研究所使用的金刚石对顶砧之中。本项目拟开展金刚石在低温高压下原位磁性表征，通过在高压腔中放置金刚石氮空位中心自旋作为原位的量子传感探针，利用激光和射频微波脉冲远程操控并实时高效地探测自旋探针状态，实现高压下样品局部磁性的原位灵敏表征。该方案能提供媲美超导量子干涉仪的磁性测量灵敏度，工作在极宽温区并拥有微米尺度的空间分辨率，实现传统高压测磁方案无法探测的微弱磁信号的可靠测量，并进一步开展高压下超导现象测定和超导机理探索等前沿科学问题的实验研究，实现微米级氢化物在高压下超导抗磁性的迈斯纳效应原位直接测量。

The nitrogen vacancy centers in diamond play important role in quantum information processing and quantum computing. The electron spin of nitrogen vacancy center can be initialized, manipulated and read out by optical and microwave pulses at room temperature. Diamond can work under high pressure and its electron spin can be used as a sensitive probe for weak magnetic field sensing. Nitrogen vacancy center in diamond is very suitable for quantum sensing inside the anvil cell for high pressure applications. We plan to put diamond with nitrogen vacancy centers inside the anvil cell and use it as quantum sensing probe. By using laser and microwave pulses we can control and detect the electron spin states. Based on the electron spin states we can measure the weak magnetic field around the diamond. This scheme can provide high sensitivity as SQUID. It can work at low temperature and has micrometer spatial resolution. Based on this setup we will work on Meissner effect of hydride superconductor under high pressure.