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  • Heralded quantum steering over a high-loss channel

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    Author(s)
    Weston, Morgan M
    Slussarenko, Sergei
    Chrzanowski, Helen M
    Wollmann, Sabine
    Shalm, Lynden K
    Verma, Varun B
    Allman, Michael S
    Nam, Sae Woo
    Pryde, Geoff J
    Griffith University Author(s)
    Pryde, Geoff
    Slussarenko, Sergei
    Year published
    2018
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    Abstract
    Entanglement is the key resource for many long-range quantum information tasks, including secure communication and fundamental tests of quantum physics. These tasks require robust verification of shared entanglement, but performing it over long distances is presently technologically intractable because the loss through an optical fiber or free-space channel opens up a detection loophole. We design and experimentally demonstrate a scheme that verifies entanglement in the presence of at least 14.8 ± 0.1 dB of added loss, equivalent to approximately 80 km of telecommunication fiber. Our protocol relies on entanglement swapping ...
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    Entanglement is the key resource for many long-range quantum information tasks, including secure communication and fundamental tests of quantum physics. These tasks require robust verification of shared entanglement, but performing it over long distances is presently technologically intractable because the loss through an optical fiber or free-space channel opens up a detection loophole. We design and experimentally demonstrate a scheme that verifies entanglement in the presence of at least 14.8 ± 0.1 dB of added loss, equivalent to approximately 80 km of telecommunication fiber. Our protocol relies on entanglement swapping to herald the presence of a photon after the lossy channel, enabling event-ready implementation of quantum steering. This result overcomes the key barrier in device-independent communication under realistic high-loss scenarios and in the realization of a quantum repeater.
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    Journal Title
    Science Advances
    Volume
    4
    Issue
    1
    DOI
    https://doi.org/10.1126/sciadv.1701230
    Copyright Statement
    © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
    Subject
    Quantum physics not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/381422
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    • Journal articles

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