Quantum noise limited and entanglement-assisted magnetometry

2009/07/31 by W. Wasilewski, K. Jensen, H. Krauter +3 · 1 citation
Physics and Astronomy · #quant-ph

paper · pdf · doi:10.1103/physrevlett.104.133601

published as Phys. Rev. Lett. 104, 133601 (2010); Erratum: Phys. Rev. Lett. 104, 209902(E) (2010) · To appear in Physical Review Letters, April 9 issue (provisionally)

arxiv created 2010/03/20 · arxiv updated 2011/01/28

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 back-action evading measurement to achieve a nearly projection noise limited sensitivity. We furthermore experimentally demonstrate that Einstein-Podolsky-Rosen (EPR) 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*10¹2 atoms which allows us to achieve sub-femtoTesla/sqrt(Hz) sensitivity.

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