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  • Experimental demonstration of Gaussian protocols for one-sided device-independent quantum key distribution

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    Accepted Manuscript (AM)
    Author(s)
    Walk, Nathan
    Hosseini, Sara
    Geng, Jiao
    Thearle, Oliver
    Haw, Jing Yan
    Armstrong, Seiji
    Assad, Syed M
    Janousek, Jiri
    Ralph, Timothy C
    Symul, Thomas
    Wiseman, Howard M
    Lam, Ping Koy
    Griffith University Author(s)
    Wiseman, Howard M.
    Year published
    2016
    Metadata
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    Abstract
    Nonlocal correlations, a longstanding foundational topic in quantum information, have recently found application as a resource for cryptographic tasks where not all devices are trusted, for example, in settings with a highly secure central hub, such as a bank or government department, and less secure satellite stations, which are inherently more vulnerable to hardware “hacking” attacks. The asymmetric phenomena of Einstein–Podolsky–Rosen (EPR) steering plays a key role in one-sided device-independent (1sDI) quantum key distribution (QKD) protocols. In the context of continuous-variable (CV) QKD schemes utilizing Gaussian ...
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    Nonlocal correlations, a longstanding foundational topic in quantum information, have recently found application as a resource for cryptographic tasks where not all devices are trusted, for example, in settings with a highly secure central hub, such as a bank or government department, and less secure satellite stations, which are inherently more vulnerable to hardware “hacking” attacks. The asymmetric phenomena of Einstein–Podolsky–Rosen (EPR) steering plays a key role in one-sided device-independent (1sDI) quantum key distribution (QKD) protocols. In the context of continuous-variable (CV) QKD schemes utilizing Gaussian states and measurements, we identify all protocols that can be 1sDI and their maximum loss tolerance. Surprisingly, this includes a protocol that uses only coherent states. We also establish a direct link between the relevant EPR steering inequality and the secret key rate, further strengthening the relationship between these asymmetric notions of nonlocality and device independence. We experimentally implement both entanglement-based and coherent-state protocols, and measure the correlations necessary for 1sDI key distribution up to an applied loss equivalent to 7.5 and 3.5 km of optical fiber transmission, respectively. We also engage in detailed modeling to understand the limits of our current experiment and the potential for further improvements. The new protocols we uncover apply the cheap and efficient hardware of CV-QKD systems in a significantly more secure setting.
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    Journal Title
    Optica
    Volume
    3
    Issue
    6
    DOI
    https://doi.org/10.1364/OPTICA.3.000634
    Copyright Statement
    © 2016 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
    Subject
    Atomic, molecular and optical physics
    Atomic, molecular and optical physics not elsewhere classified
    Communications engineering
    Publication URI
    http://hdl.handle.net/10072/142504
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    • Journal articles

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