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  • Optimal Heisenberg-style bounds for the average performance of arbitrary phase estimates

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    Author(s)
    Berry, Dominic W
    Hall, Michael JW
    Zwierz, Marcin
    Wiseman, Howard M
    Griffith University Author(s)
    Wiseman, Howard M.
    Year published
    2012
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    Abstract
    The ultimate bound to the accuracy of phase estimates is often assumed to be given by the Heisenberg limit. Recent work seemed to indicate that this bound can be violated, yielding measurements with much higher accuracy than was previously expected. The Heisenberg limit can be restored as a rigorous bound to the accuracy provided one considers the accuracy averaged over the possible values of the unknown phase, as we have recently shown [Phys. Rev. A 85, 041802(R) (2012)]. Here we present an expanded proof of this result together with a number of additional results, including the proof of a previously conjectured stronger ...
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    The ultimate bound to the accuracy of phase estimates is often assumed to be given by the Heisenberg limit. Recent work seemed to indicate that this bound can be violated, yielding measurements with much higher accuracy than was previously expected. The Heisenberg limit can be restored as a rigorous bound to the accuracy provided one considers the accuracy averaged over the possible values of the unknown phase, as we have recently shown [Phys. Rev. A 85, 041802(R) (2012)]. Here we present an expanded proof of this result together with a number of additional results, including the proof of a previously conjectured stronger bound in the asymptotic limit. Other measures of the accuracy are examined, as well as other restrictions on the generator of the phase shifts.We provide expanded numerical results for the minimum error and asymptotic expansions. The significance of the results claiming violation of the Heisenberg limit is assessed, followed by a detailed discussion of the limitations of the Cram䥲-Rao bound.
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    Journal Title
    Physical Review A
    Volume
    86
    Issue
    5
    DOI
    https://doi.org/10.1103/PhysRevA.86.053813
    Copyright Statement
    © 2012 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Mathematical sciences
    Physical sciences
    Quantum information, computation and communication
    Quantum optics and quantum optomechanics
    Chemical sciences
    Publication URI
    http://hdl.handle.net/10072/48599
    Collection
    • Journal articles

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