Quantum noise limited and entanglement-assisted magnetometry.
Phys Rev Lett
; 104(13): 133601, 2010 Apr 02.
Article
em En
| MEDLINE
| ID: mdl-20481884
ABSTRACT
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 1.5x10(12) atoms which allows us to achieve subfemtotesla/square root(Hz) sensitivity.
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2010
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Article
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Dinamarca