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  • Experimental measurement-device-independent verification of quantum steering

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    Accepted Manuscript (AM)
    Author(s)
    Kocsis, Sacha
    Hall, Michael JW
    Bennet, Adam J
    Saunders, Dylan J
    Pryde, Geoff J
    Griffith University Author(s)
    Pryde, Geoff
    Year published
    2015
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    Abstract
    Bell non-locality between distant quantum systems—that is, joint correlations which violate a Bell inequality—can be verified without trusting the measurement devices used, nor those performing the measurements. This leads to unconditionally secure protocols for quantum information tasks such as cryptographic key distribution. However, complete verification of Bell non-locality requires high detection efficiencies, and is not robust to typical transmission losses over long distances. In contrast, quantum or Einstein–Podolsky–Rosen steering, a weaker form of quantum correlation, can be verified for arbitrarily low detection ...
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    Bell non-locality between distant quantum systems—that is, joint correlations which violate a Bell inequality—can be verified without trusting the measurement devices used, nor those performing the measurements. This leads to unconditionally secure protocols for quantum information tasks such as cryptographic key distribution. However, complete verification of Bell non-locality requires high detection efficiencies, and is not robust to typical transmission losses over long distances. In contrast, quantum or Einstein–Podolsky–Rosen steering, a weaker form of quantum correlation, can be verified for arbitrarily low detection efficiencies and high losses. The cost is that current steering-verification protocols require complete trust in one of the measurement devices and its operator, allowing only one-sided secure key distribution. Here we present measurement-device-independent steering protocols that remove this need for trust, even when Bell non-locality is not present. We experimentally demonstrate this principle for singlet states and states that do not violate a Bell inequality.
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    Journal Title
    Nature Communications
    Volume
    6
    DOI
    https://doi.org/10.1038/ncomms6886
    Copyright Statement
    © 2015 Nature Publishing Group. 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/10072/167484
    Collection
    • Journal articles

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