论文标题
NV-Diamond磁显微镜使用双量子4-Ramsey方案
NV-Diamond Magnetic Microscopy using a Double Quantum 4-Ramsey Protocol
论文作者
论文摘要
我们引入了双量子（DQ）4-Ramsey测量方案，该方案可以使用钻石中的氮空位（NV）中心实现宽场磁成像，相对于常规单量子（SQ）技术，磁性灵敏度的均匀性增强。 DQ 4-Ramsey协议在四个连续的Ramsey（4-Ramsey）测量中采用微波相交替，以将所需的DQ磁信号从微波脉冲误差引起的任何残留SQ信号中分离出来。在宏观钻石芯片中采用1- $ $ m thick NV层的演示实验中，DQ 4-Ramsey协议提供了$η^\ text {v} = 34 \，$ nthz $ nthz $^{ - 1/1/2} $ $ m $ m $ $ m $ $^$ $^$ $^$^$^$^$^$^$^$^$^$^$^3/3/3/3/3/3/34 $^$^3/3/3/3/3/3/ \，\ times \，125 \，μ$ m视场，与SQ测量相比，整个视野敏感性的空间变化约为5 $ \ times $。 DQ 4-Ramsey协议的鲁棒性和磁敏感性的提高，可以对动态的宽带磁源（例如集成电路和电动电池）进行成像。
We introduce a double quantum (DQ) 4-Ramsey measurement protocol that enables wide-field magnetic imaging using nitrogen vacancy (NV) centers in diamond, with enhanced homogeneity of the magnetic sensitivity relative to conventional single quantum (SQ) techniques. The DQ 4-Ramsey protocol employs microwave-phase alternation across four consecutive Ramsey (4-Ramsey) measurements to isolate the desired DQ magnetic signal from any residual SQ signal induced by microwave pulse errors. In a demonstration experiment employing a 1-$μ$m-thick NV layer in a macroscopic diamond chip, the DQ 4-Ramsey protocol provides volume-normalized DC magnetic sensitivity of $η^\text{V}=34\,$nTHz$^{-1/2} μ$m$^{3/2}$ across a $125\,μ$m$ \,\times\,125\,μ$m field of view, with about 5$\times$ less spatial variation in sensitivity across the field of view compared to a SQ measurement. The improved robustness and magnetic sensitivity homogeneity of the DQ 4-Ramsey protocol enable imaging of dynamic, broadband magnetic sources such as integrated circuits and electrically-active cells.
