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Published May 27, 2005 | public
Journal Article Open

Suppression of spin projection noise in broadband atomic magnetometry


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.

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.


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