Quantum noise limited and entanglement-assisted magnetometry

Wojciech Wasilewski; Kasper Jensen; Hanna Krauter; Jelmer Jan Renema; M.V. Balabas; Eugene Simon Polzik

doi:10.1103/PhysRevLett.104.133601

Quantum noise limited and entanglement-assisted magnetometry

Wojciech Wasilewski, Kasper Jensen, Hanna Krauter, Jelmer Jan Renema, M.V. Balabas, Eugene Simon Polzik

257 Citationer (Scopus)

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 1.5×1012atoms which allows us to achieve subfemtotesla/ √Hz sensitivity.

Originalsprog	Engelsk
Tidsskrift	Physical Review Letters
Vol/bind	104
Udgave nummer	13
Sider (fra-til)	133601
Antal sider	4
ISSN	0031-9007
DOI	https://doi.org/10.1103/PhysRevLett.104.133601
Status	Udgivet - 31 mar. 2010

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10.1103/PhysRevLett.104.133601

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AU - Wasilewski, Wojciech

AU - Jensen, Kasper

AU - Krauter, Hanna

AU - Renema, Jelmer Jan

AU - Balabas, M.V.

AU - Polzik, Eugene Simon

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N2 - 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 1.5×1012atoms which allows us to achieve subfemtotesla/ √Hz sensitivity.

AB - 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 1.5×1012atoms which allows us to achieve subfemtotesla/ √Hz sensitivity.

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DO - 10.1103/PhysRevLett.104.133601

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Quantum noise limited and entanglement-assisted magnetometry

Abstract

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