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arXiv 2103.12757quant-phcond-mat.mtrl-sci
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用单量子传感器探测金刚石表面的自旋动力学

Probing spin dynamics on diamond surfaces using a single quantum sensor

Bo L. Dwyer, Lila V. H. Rodgers, Elana K. Urbach, Dolev Bluvstein, Sorawis Sangtawesin, Hengyun Zhou, Yahia Nassab, Mattias Fitzpatrick, Zhiyang Yuan, Kristiaan… 展开作者

Bo L. Dwyer, Lila V. H. Rodgers, Elana K. Urbach, Dolev Bluvstein, Sorawis Sangtawesin, Hengyun Zhou, Yahia Nassab, Mattias Fitzpatrick, Zhiyang Yuan, Kristiaan De Greve, Eric L. Peterson, Jyh-Pin Chou, Adam Gali, V. V. Dobrovitski, Mikhail D. Lukin, Nathalie P. de Leon

摘要:

理解量子比特环境的动力学对于实现用于量子信息处理和计量的实用系统是必不可少的。我们利用金刚石中的单氮空位中心来研究金刚石表面无序自旋系综的动力学。具体来说,我们调整“暗”表面自旋的密度,以询问它们对浅NV中心自旋量子比特的退相干的贡献。当平均表面自旋间距超过NV中心深度时,我们发现表面自旋对NV中心自由感应衰减的贡献可以用一个变幂n的拉伸指数来描述。我们表明,这些意见是一致的模型,其中表面自旋的空间位置是固定的每次测量,但其中一些重新配置之间的测量。特别是,我们观察到一个深度相关的临界时间与动态过渡从高斯(n=2)衰变到n=2/3,并表明,这种过渡产生于许多遥远的自旋和强耦合到几个近端自旋在表面的小衰变贡献之间的竞争。这些观察结果表明,本地传感器的潜力,了解复杂系统,并阐明了改善和控制自旋量子位在表面的途径。

英文摘要:

Understanding the dynamics of a quantum bit's environment is essential for the realization of practical systems for quantum information processing and metrology. We use single nitrogen-vacancy (NV) centers in diamond to study the dynamics of a disordered spin ensemble at the diamond surface. Specifically, we tune the density of "dark" surface spins to interrogate their contribution to the decoherence of shallow NV center spin qubits. When the average surface spin spacing exceeds the NV center depth, we find that the surface spin contribution to the NV center free induction decay can be described by a stretched exponential with variable power n. We show that these observations are consistent with a model in which the spatial positions of the surface spins are fixed for each measurement, but some of them reconfigure between measurements. In particular, we observe a depth-dependent critical time associated with a dynamical transition from Gaussian (n=2) decay to n=2/3, and show that this transition arises from the competition between the small decay contributions of many distant spins and strong coupling to a few proximal spins at the surface. These observations demonstrate the potential of a local sensor for understanding complex systems and elucidate pathways for improving and controlling spin qubits at the surface.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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