Experimental plug and play quantum coin flipping

Abstract : Performing complex cryptographic tasks will be an essential element in future quantum communica-tion networks. These tasks are based on a handful of fundamental primitives, such as coin flipping, where two distrustful parties wish to agree on a randomly generated bit. Although it is known that quantum versions of these primitives can offer information-theoretic security advantages with respect to classical protocols, a demonstration of such an advantage in a practical communication scenario has remained elusive. Here, we experimentally implement a quantum coin flipping protocol that performs strictly better than classically possible over a distance suitable for communication over metropolitan area optical networks. The implementation is based on a practical plug&play sys-tem, designed for quantum key distribution. We also show how to combine our protocol with coin flipping protocols that are almost perfectly secure against bounded adversaries, hence enhancing them with a level of information-theoretic security. Our results offer a powerful toolbox for future secure quantum communications.
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Submitted on : Monday, December 22, 2014 - 11:54:03 AM
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Anna Pappa, Paul Jouguet, Thomas Lawson, André Chailloux, Matthieu Legré, et al.. Experimental plug and play quantum coin flipping. Nature Communications, Nature Publishing Group, 2014, pp.9. ⟨10.1038/ncomms4717⟩. ⟨hal-01094106⟩

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