Origins of Diamond Surface Noise Probed by Correlating Single-Spin Measurements with Surface Spectroscopy
Origins of Diamond Surface Noise Probed by Correlating Single-Spin Measurements with Surface Spectroscopy
复制标题
DOI：
10.1103/physrevx.9.031052
复制
发表时间：
2019-09-26
影响因子：
12.5
通讯作者：
de Leon, Nathalie P.
中科院分区：
文献类型：
--
作者：
Sangtawesin, Sorawis;Dwyer, Bo L.;de Leon, Nathalie P.
金刚石中的氮空位(NV)中心在环境条件下表现出与自旋相关的荧光和较长的自旋相干时间，使其能够应用于量子信息处理和传感。靠近表面的NV中心可以与外部材料和自旋有很强的相互作用，从而实现了新形式的纳米光谱。然而，NV自旋相干性在表面100 nm范围内退化，这表明金刚石表面存在着普遍存在的缺陷。以前研究近地表噪声的工作主要依赖于使用NV中心本身作为探测器；虽然这具有敏感度高的优点，但它只提供关于噪声来源的间接信息。在这里，我们演示了表面光谱学方法和单自旋测量可以作为补充诊断来理解噪声源。我们发现表面形态对于实现可重复的化学终止是至关重要的，并利用这一洞察力来获得高度有序的、氧终止的表面，并抑制噪声。我们观察到表面10 nm范围内的NV中心，相干时间延长了一个数量级。
The nitrogen-vacancy (NV) center in diamond exhibits spin-dependent fluorescence and long spin coherence times under ambient conditions, enabling applications in quantum information processing and sensing. NV centers near the surface can have strong interactions with external materials and spins, enabling new forms of nanoscale spectroscopy. However, NV spin coherence degrades within 100 nm of the surface, suggesting that diamond surfaces are plagued with ubiquitous defects. Prior work on characterizing near-surface noise has primarily relied on using NV centers themselves as probes; while this has the advantage of exquisite sensitivity, it provides only indirect information about the origin of the noise. Here we demonstrate that surface spectroscopy methods and single-spin measurements can be used as complementary diagnostics to understand sources of noise. We find that surface morphology is crucial for realizing reproducible chemical termination, and use this insight to achieve a highly ordered, oxygen-terminated surface with suppressed noise. We observe NV centers within 10 nm of the surface with coherence times extended by an order of magnitude.