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  • Adaptive Optical Phase Estimation Using Time-Symmetric Quantum Smoothing

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    62903_1.pdf (236.7Kb)
    Author(s)
    Wheatley, TA
    Berry, DW
    Yonezawa, H
    Nakane, D
    Arao, H
    Pope, DT
    Ralph, TC
    Wiseman, HM
    Furusawa, A
    Huntington, EH
    Griffith University Author(s)
    Wiseman, Howard M.
    Year published
    2010
    Metadata
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    Abstract
    Quantum parameter estimation has many applications, from gravitational wave detection to quantum key distribution. The most commonly used technique for this type of estimation is quantum filtering, using only past observations. We present the first experimental demonstration of quantum smoothing, a time-symmetric technique that uses past and future observations, for quantum parameter estimation. We consider both adaptive and nonadaptive quantum smoothing, and show that both are better than their filtered counterparts. For the problem of estimating a stochastically varying phase shift on a coherent beam, our theory predicts ...
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    Quantum parameter estimation has many applications, from gravitational wave detection to quantum key distribution. The most commonly used technique for this type of estimation is quantum filtering, using only past observations. We present the first experimental demonstration of quantum smoothing, a time-symmetric technique that uses past and future observations, for quantum parameter estimation. We consider both adaptive and nonadaptive quantum smoothing, and show that both are better than their filtered counterparts. For the problem of estimating a stochastically varying phase shift on a coherent beam, our theory predicts that adaptive quantum smoothing (the best scheme) gives an estimate with a mean-square error up to 2v2 times smaller than nonadaptive filtering (the standard quantum limit). The experimentally measured improvement is 2.24ᰮ14.
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    Journal Title
    Physical Review Letters
    Volume
    104
    Issue
    9
    DOI
    https://doi.org/10.1103/PhysRevLett.104.093601
    Copyright Statement
    © 2010 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 optics and quantum optomechanics
    Engineering
    Publication URI
    http://hdl.handle.net/10072/33167
    Collection
    • Journal articles

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