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Suppression of spin projection noise in broadband atomic magnetometry

Geremia, J. M. and Stockton, John K. and Mabuchi, Hideo (2005) Suppression of spin projection noise in broadband atomic magnetometry. Physical Review Letters, 94 (20). Art. No. 203002. ISSN 0031-9007. doi:10.1103/PhysRevLett.94.203002.

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We demonstrate that quantum nondemolition measurement, combined with a suitable parameter estimation procedure, can improve the sensitivity of a broadband atomic magnetometer by reducing uncertainty due to spin projection noise. Furthermore, we provide evidence that real-time quantum feedback control offers robustness to classical uncertainties, including shot-to-shot atom number fluctuations, that would otherwise prevent quantum-limited performance.

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Additional Information:©2005 The American Physical Society. Received 2 September 2003; revised 15 February 2005; published 24 May 2005. This work was supported by the NSF (PHY-9987541, EIA-0086038), the ONR (N00014-00-1-0479), and the Caltech MURI Center for Quantum Networks (DAAD19-00-1-0374). J. K. S. acknowledges the Hertz Foundation. We thank Ramon van Handel, Andrew Berglund, Michael Armen, Andrew Doherty, Dima Budker, and Dan Kleppner and Vladan Vuletic for helpful discussions.
Subject Keywords:noise; atomic moments; magnetic moments; fluctuations; magnetic variables measurement; feedback; quantum theory; caesium; radiation pressure; heavy fermion superconductors; hyperfine structure
Issue or Number:20
Record Number:CaltechAUTHORS:GERprl05
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3048
Deposited By: Tony Diaz
Deposited On:12 May 2006
Last Modified:08 Nov 2021 19:52

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