Adaptive quantum measurements of a continuously varying phase

D. W. Berry, H. M. Wiseman

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    Abstract

    The quantum-limited estimation of stochastically varying phase of a continuous beam of the electromagnetic field was analyzed. Both nonadaptive and adaptive measurements, and dyne detection (using a local oscillator) and interferometric detection were considered. For the case of dyne detection, a coherent beam resulted with phase invariance≅N-1/2/2, which was √2 times smaller than that achieved by nonadaptive detection. For a squeezed beam, variance scaling was N-2/3 compared to N-1/2 for heterodyne detection.

    Original languageEnglish
    Article number043803
    Pages (from-to)1-11
    Number of pages11
    JournalPhysical Review A. Atomic, Molecular, and Optical Physics
    Volume65
    Issue number4
    DOIs
    Publication statusPublished - 2002

    Bibliographical note

    Copyright 2002 by The American Physical Society. Reprinted from Physical review A.

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