Spurious Harmonic Response of Multipulse Quantum Sensing Sequences
Spurious Harmonic Response of Multipulse Quantum Sensing Sequences
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DOI：
10.1103/physrevx.5.021009
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发表时间：
2015-04-22
影响因子：
12.5
通讯作者：
Degen, C. L.
中科院分区：
文献类型：
--
作者：
Loretz, M.;Boss, J. M.;Degen, C. L.
基于卡尔-珀塞尔解耦的多脉冲序列经常用于单自旋磁力测量中的窄带信号检测。我们分析了现实条件下多脉冲传感序列的行为，包括有限脉冲持续时间和失谐的存在。我们发现这些非理想性向滤波器函数引入了谐波，从而允许额外的频率通过滤波器。特别是，我们发现 XY 系列序列可以生成 2f(ac)、4f(ac) 和 8f(ac) 谐波及其奇次谐波信号，其中 f(ac) 是交流信号频率。考虑谐波响应对于基于金刚石的核自旋传感尤其重要，其中核磁共振频率用于识别核自旋物种，因为当存在多种同位素时，它会导致模糊性。
Multipulse sequences based on Carr-Purcell decoupling are frequently used for narrow-band signal detection in single-spin magnetometry. We have analyzed the behavior of multipulse sensing sequences under real-world conditions, including finite pulse durations and the presence of detunings. We find that these nonidealities introduce harmonics to the filter function, allowing additional frequencies to pass the filter. In particular, we find that the XY family of sequences can generate signals at the 2f(ac), 4f(ac), and 8f(ac) harmonics and their odd subharmonics, where f(ac) is the ac signal frequency. Consideration of the harmonic response is especially important for diamond-based nuclear-spin sensing where the nuclear magnetic resonance frequency is used to identify the nuclear-spin species, as it leads to ambiguities when several isotopes are present.