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  • Experimental generalized contextuality with single-photon qubits

    Author(s)
    Zhan, Xiang
    Cavalcanti, Eric G
    Li, Jian
    Bian, Zhihao
    Zhang, Yongsheng
    Wiseman, Howard M
    Xue, Peng
    Griffith University Author(s)
    Wiseman, Howard M.
    Cavalcanti, Eric G.
    Year published
    2017
    Metadata
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    Abstract
    Contextuality is a phenomenon at the heart of the quantum mechanical departure from classical behavior, and has been recently identified as a resource in quantum computation. Experimental demonstration of contextuality is thus an important goal. The traditional form of contextuality—as violation of a Kochen–Specker inequality—requires a quantum system with at least three levels, and the status of the assumption of determinism used in deriving those inequalities has been controversial. By considering “unsharp” observables, Liang, Spekkens, and Wiseman (LSW) derived an inequality for generalized noncontextual models that does ...
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    Contextuality is a phenomenon at the heart of the quantum mechanical departure from classical behavior, and has been recently identified as a resource in quantum computation. Experimental demonstration of contextuality is thus an important goal. The traditional form of contextuality—as violation of a Kochen–Specker inequality—requires a quantum system with at least three levels, and the status of the assumption of determinism used in deriving those inequalities has been controversial. By considering “unsharp” observables, Liang, Spekkens, and Wiseman (LSW) derived an inequality for generalized noncontextual models that does not assume determinism, and applies already to a qubit. We experimentally implement the LSW test using the polarization states of a heralded single photon and three unsharp binary measurements. We violate the LSW inequality by more than 16 standard deviations, thus showing that our results cannot be reproduced by a noncontextual subset of quantum theory.
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    Journal Title
    Optica
    Volume
    4
    Issue
    8
    DOI
    https://doi.org/10.1364/OPTICA.4.000966
    Subject
    Optical Physics not elsewhere classified
    Optical Physics
    Electrical and Electronic Engineering
    Communications Technologies
    Publication URI
    http://hdl.handle.net/10072/364659
    Collection
    • Journal articles

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