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  • Violation of the Leggett-Garg inequality with weak measurements of photons

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    Author(s)
    Goggin, ME
    Almeida, MP
    Barbieri, M
    Lanyon, BP
    O'Brien, JL
    White, AG
    Pryde, GJ
    Griffith University Author(s)
    Pryde, Geoff
    Year published
    2011
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    Abstract
    By weakly measuring the polarization of a photon between two strong polarization measurements, we experimentally investigate the correlation between the appearance of anomalous values in quantum weak measurements and the violation of realism and nonintrusiveness of measurements. A quantitative formulation of the latter concept is expressed in terms of a Leggett-Garg inequality for the outcomes of subsequent measurements of an individual quantum system. We experimentally violate the Leggett-Garg inequality for several measurement strengths. Furthermore, we experimentally demonstrate that there is a one-to-one correlation ...
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    By weakly measuring the polarization of a photon between two strong polarization measurements, we experimentally investigate the correlation between the appearance of anomalous values in quantum weak measurements and the violation of realism and nonintrusiveness of measurements. A quantitative formulation of the latter concept is expressed in terms of a Leggett-Garg inequality for the outcomes of subsequent measurements of an individual quantum system. We experimentally violate the Leggett-Garg inequality for several measurement strengths. Furthermore, we experimentally demonstrate that there is a one-to-one correlation between achieving strange weak values and violating the Leggett-Garg inequality.
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    Journal Title
    Proceedings of National Academy of Sciences
    Volume
    108
    Issue
    4
    DOI
    https://doi.org/10.1073/pnas.1005774108
    Copyright Statement
    © 2011 National Academy of Sciences. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
    Subject
    Quantum information, computation and communication
    Quantum optics and quantum optomechanics
    Publication URI
    http://hdl.handle.net/10072/41081
    Collection
    • Journal articles

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