期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.133601
关键词
-
资金
- EU [QAP, COMPAS, Q-ESSENCE]
We study experimentally the fundamental limits of sensitivity of an atomic radio-frequency magnetometer. First, we apply an optimal sequence of state preparation, evolution, and the backaction evading measurement to achieve a nearly projection noise limited sensitivity. We furthermore experimentally demonstrate that Einstein-Podolsky-Rosen entanglement of atoms generated by a measurement enhances the sensitivity to pulsed magnetic fields. We demonstrate this quantum limited sensing in a magnetometer utilizing a truly macroscopic ensemble of 1: 5 x 10(12) atoms which allows us to achieve subfemtotesla/root Hz sensitivity.
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