Report
Ultrasensitive Magnetometer Using a Single Atom
| العنوان: | Ultrasensitive Magnetometer Using a Single Atom |
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| المؤلفون: | Baumgart, I., Cai, J. -M., Retzker, A., Plenio, M. B., Wunderlich, Ch. |
| المصدر: | Phys. Rev. Lett. 116, 240801 (2016) |
| سنة النشر: | 2014 |
| المجموعة: | Physics (Other) Quantum Physics |
| مصطلحات موضوعية: | Quantum Physics, Physics - Atomic Physics |
| الوصف: | 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. Comment: Replaced with final published version. Extended Supplemental Material |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.116.240801 |
| URL الوصول: | http://arxiv.org/abs/1411.7893 |
| رقم الانضمام: | edsarx.1411.7893 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.116.240801 |
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