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  • Optimal States and Almost Optimal Adaptive Measurements for Quantum Interferometry

    Author(s)
    Berry, DW
    Wiseman, HM
    Griffith University Author(s)
    Wiseman, Howard M.
    Year published
    2000
    Metadata
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    Abstract
    We derive the optimal N-photon two-mode input state for obtaining an estimate f of the phase difference between two arms of an interferometer. For an optimal measurement [B. C. Sanders and G. J. Milburn, Phys. Rev. Lett. 75, 2944 (1995)], it yields a variance (?f)2?p2/N2, compared to O(N-1) or O(N-1/2) for states considered by previous authors. Such a measurement cannot be realized by counting photons in the interferometer outputs. However, we introduce an adaptive measurement scheme that can be thus realized, and show that it yields a variance in f very close to that from an optimal measurementWe derive the optimal N-photon two-mode input state for obtaining an estimate f of the phase difference between two arms of an interferometer. For an optimal measurement [B. C. Sanders and G. J. Milburn, Phys. Rev. Lett. 75, 2944 (1995)], it yields a variance (?f)2?p2/N2, compared to O(N-1) or O(N-1/2) for states considered by previous authors. Such a measurement cannot be realized by counting photons in the interferometer outputs. However, we introduce an adaptive measurement scheme that can be thus realized, and show that it yields a variance in f very close to that from an optimal measurement
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    Journal Title
    Physical Review Letters
    Volume
    85
    Issue
    24
    Publisher URI
    http://prola.aps.org/abstract/PRL/v85/i24/p5098_1
    DOI
    https://doi.org/10.1103/PhysRevLett.85.5098
    Copyright Statement
    © 2000 American Physical Society. Reproduced in accordance with the copyright policy of the publisher. This journal is available online - use hypertext links.
    Subject
    Mathematical sciences
    Physical sciences
    Engineering
    History, heritage and archaeology
    Publication URI
    http://hdl.handle.net/10072/3116
    Collection
    • Journal articles

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