TY - JOUR

T1 - Quantum noise limited and entanglement-assisted magnetometry

AU - Wasilewski, W.

AU - Jensen, K.

AU - Krauter, H.

AU - Renema, J. J.

AU - Balabas, M. V.

AU - Polzik, E. S.

N1 - Copyright: Copyright 2010 Elsevier B.V., All rights reserved.

PY - 2010/3/31

Y1 - 2010/3/31

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.

UR - http://www.scopus.com/inward/record.url?scp=77950441891&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.104.133601

DO - 10.1103/PhysRevLett.104.133601

M3 - Article

VL - 104

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 13

M1 - 133601

ER -