以氮空位(NV)色心磁强计为基础,量子自旋调控为技术手段,结合空间梯度磁场的均匀变化,实现基于固态量子自旋的高精度微位移检测。首先,通过永磁体构建均匀变化的梯度磁场,并获得梯度磁场与位移的关联关系;其次,搭建量子自旋调控系统,并通过光探测磁共振(ODMR)确定自旋共振频点,利用拉比振荡(Rabi)确定量子调控翻转周期,完成拉姆齐(Ramsey)序列参数的测定;最后,基于Ramsey磁场测量原理,完成Ramsey所对应的荧光强度与磁场梯度变化的测试,进而实现微位移的高分辨测量,位移的最小可分辨力约为104nm。
Abstract
In order to realize high-precision micro-displacement detection, the nitrogen-vacancy (NV) color center magnetometer is taken as the basis, and testing is conducted using the quantum spin regulation principle and uniform variation of spatial gradient magnetic field. Firstly, the gradient magnetic field is constructed with uniform variation by the permanent magnet, and the correlation between the magnetic field gradient and displacement is obtained. Secondly, the Ramsay sequence parameters required in the experiment is determined by testing the NV color center optical detection magnetic resonance (ODMR) frequency points and determining the quantum flip period corresponding to the Rabi oscillation in the time domain. Finally, the correlation of fluorescence intensity and magnetic field gradient is completed based on the Ramsey magnetic field measurement principle. The relationship between fluorescence intensity and micro-displacement change is obtained, and the micro-displacement measurement is realized. The minimum resolution of displacement is about 104nm.
关键词
几何量计量 /
微位移 /
固态量子自旋 /
氮空位色心 /
磁强计 /
拉姆齐
Key words
geometric measurement /
micro-displacement /
solid state quantum spin /
nitrogen-vacancy color center /
magnetometer;Ramsey
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