arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1411.7893quant-phphysics.atom-ph
收藏

单原子超灵敏磁强计

Ultrasensitive Magnetometer Using a Single Atom

I. Baumgart, J. -M. Cai, A. Retzker, M. B. Plenio, Ch. Wunderlich

备注：
Replaced with final published version. Extended Supplemental Material
发表信息：
Phys. Rev. Lett. 116, 240801 (2016)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

精密传感，特别是高精度磁力测量，是量子技术研究的核心目标。对于磁力计，通常在灵敏度、空间分辨率和频率范围之间存在权衡。磁力测定的精确度以及灵敏度与起关键决定因素作用的感测系统的相位相干时间$T_2$成$1/\sqrt {T_2}$的比例。适应的动态解耦方案，允许扩展$T_2$的数量级和合并它与磁传感协议，我们实现了测量灵敏度，即使是接近标准量子极限的高频领域。使用一个单一的原子离子作为传感器，我们在实验上达到了$4.6$ pT $/\sqrt{Hz}$的灵敏度为交流磁场近14 MHz。基于这里所展示的原理，这种前所未有的灵敏度与纳米范围内的空间分辨率和从直流到千兆赫范围的可调谐性相结合，可用于尚未达到的参数制度中的磁成像。

英文摘要：

Precision sensing, and in particular high precision magnetometry, is a central goal of research into quantum technologies. For magnetometers, often trade-offs exist between sensitivity, spatial resolution, and frequency range. The precision, and thus the sensitivity of magnetometry, scales as $1/\sqrt {T_2}$ with the phase coherence time, $T_2$, of the sensing system playing the role of a key determinant. Adapting a dynamical decoupling scheme that allows for extending $T_2$ by orders of magnitude and merging it with a magnetic sensing protocol, we achieve a measurement sensitivity even for high frequency fields close to the standard quantum limit. Using a single atomic ion as a sensor, we experimentally attain a sensitivity of $4.6$ pT $/\sqrt{Hz}$ for an alternating-current magnetic field near 14 MHz. Based on the principle demonstrated here, this unprecedented sensitivity combined with spatial resolution in the nanometer range and tunability from direct-current to the gigahertz range could be used for magnetic imaging in as of yet inaccessible parameter regimes.

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。

↑