Quantum Sensing via Magnetic‐Noise‐Protected States in an Electronic Spin Dyad
Quantum Sensing via Magnetic‐Noise‐Protected States in an Electronic Spin Dyad
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DOI：
10.1002/qute.202300098
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发表时间：
2023-06
影响因子：
4.4
通讯作者：
C. Meriles;P. Zangara;D. Pagliero
中科院分区：
文献类型：
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作者：
C. Meriles;P. Zangara;D. Pagliero
延长量子位的相干寿命是量子技术实施和部署的核心，特别是在固态中，材料主体固有的各种噪声源起着限制作用。在这里，我们从理论上研究了由自旋 S=1 形成的异质自旋系统的相干自旋动力学，该系统具有非零晶体场并且接近顺磁中心 S'=1/2。我们利用二元体的奇异能级结构来识别与磁场不敏感跃迁频率相关的能级对，并从理论上表明，我们在它们之间创建的零量子相干性可以非常长久。此外，我们发现这些相干性对“局部”场波动选择性敏感，而不是“全局”场波动，这表明这些自旋二元体可以用作精密磁力测量的纳米级梯度计或用作无磁噪声静电测量和热传感的探针。
Extending the coherence lifetime of a qubit is central to the implementation and deployment of quantum technologies, particularly in the solid-state where various noise sources intrinsic to the material host play a limiting role. Here, we theoretically investigate the coherent spin dynamics of a hetero-spin system formed by a spin S=1 featuring a non-zero crystal field and in proximity to a paramagnetic center S'=1/2. We capitalize on the singular energy level structure of the dyad to identify pairs of levels associated to magnetic-field-insensitive transition frequencies, and theoretically show that the zero-quantum coherences we create between them can be remarkably long-lived. Further, we find these coherences are selectively sensitive to 'local' - as opposed to 'global' - field fluctuations, suggesting these spin dyads could be exploited as nanoscale gradiometers for precision magnetometry or as probes for magnetic-noise-free electrometry and thermal sensing.