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Almost quantum correlations

Author

Listed:
  • Miguel Navascués

    (Bilkent University
    Universitat Autònoma de Barcelona
    H.H. Wills Physics Laboratory, University of Bristol)

  • Yelena Guryanova

    (H.H. Wills Physics Laboratory, University of Bristol)

  • Matty J. Hoban

    (ICFO-Institut de Ciencies Fotoniques
    University of Oxford)

  • Antonio Acín

    (ICFO-Institut de Ciencies Fotoniques
    ICREA—Institucio Catalana de Recerca i Estudis Avançats)

Abstract

Quantum theory is not only successfully tested in laboratories every day but also constitutes a robust theoretical framework: small variations usually lead to implausible consequences, such as faster-than-light communication. It has even been argued that quantum theory may be special among possible theories. Here we report that, at the level of correlations among different systems, quantum theory is not so special. We define a set of correlations, dubbed ‘almost quantum’, and prove that it strictly contains the set of quantum correlations but satisfies all-but-one of the proposed principles to capture quantum correlations. We present numerical evidence that the remaining principle is satisfied too.

Suggested Citation

  • Miguel Navascués & Yelena Guryanova & Matty J. Hoban & Antonio Acín, 2015. "Almost quantum correlations," Nature Communications, Nature, vol. 6(1), pages 1-7, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7288
    DOI: 10.1038/ncomms7288
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    Cited by:

    1. Patricia Contreras-Tejada & Giannicola Scarpa & Aleksander M. Kubicki & Adam Brandenburger & Pierfrancesco La Mura, 2021. "Observers of quantum systems cannot agree to disagree," Nature Communications, Nature, vol. 12(1), pages 1-7, December.

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