Experimental Demonstration of Entanglement-Enhanced Rotation Angle Estimation Using Trapped Ions

V. Meyer, M. A. Rowe, D. Kielpinski, C. A. Sackett, W. M. Itano, C. Monroe, and D. J. Wineland
Phys. Rev. Lett. 86, 5870 – Published 25 June 2001
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Abstract

We experimentally investigate three methods, utilizing different atomic observables and entangled states, to increase the sensitivity of rotation angle measurements beyond the “standard quantum limit” for nonentangled states. All methods use a form of quantum mechanical “squeezing.” In a system of two entangled trapped 9Be+ ions we observe a reduction in uncertainty of rotation angle below the standard quantum limit for all three methods including all sources of noise. As an application, we demonstrate an increase in precision of frequency measurement in a Ramsey spectroscopy experiment.

  • Received 26 February 2001

DOI:https://doi.org/10.1103/PhysRevLett.86.5870

©2001 American Physical Society

Authors & Affiliations

V. Meyer1, M. A. Rowe1, D. Kielpinski1, C. A. Sackett2, W. M. Itano1, C. Monroe3, and D. J. Wineland1

  • 1Time and Frequency Division, National Institute of Standards and Technology, Boulder, Colorado 80305-3328
  • 2Physics Department, University of Virginia, Charlottesville, Virginia 22904
  • 3Department of Physics, University of Michigan, Ann Arbor, Michigan 48109

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Vol. 86, Iss. 26 — 25 June 2001

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