Quantum Noise Limited and Entanglement-Assisted Magnetometry

W. Wasilewski, K. Jensen, H. Krauter, J. J. Renema, M. V. Balabas, and E. S. Polzik
Phys. Rev. Lett. 104, 133601 – Published 31 March 2010; Erratum Phys. Rev. Lett. 104, 209902 (2010)

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.

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  • Received 6 December 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.133601

©2010 American Physical Society

Erratum

Erratum: Quantum Noise Limited and Entanglement-Assisted Magnetometry [Phys. Rev. Lett. 104, 133601 (2010)]

W. Wasilewski, K. Jensen, H. Krauter, J. J. Renema, M. V. Balabas, and E. S. Polzik
Phys. Rev. Lett. 104, 209902 (2010)

Authors & Affiliations

W. Wasilewski, K. Jensen, H. Krauter, J. J. Renema, M. V. Balabas, and E. S. Polzik

  • Niels Bohr Institute, Danish Quantum Optics Center QUANTOP, Copenhagen University, Blegdamsvej 17, 2100 Copenhagen, Denmark

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Issue

Vol. 104, Iss. 13 — 2 April 2010

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