Experimental plug and play quantum coin flipping

Anna Pappa (), Paul Jouguet, Thomas Lawson, André Chailloux, Matthieu Legré, Patrick Trinkler, Iordanis Kerenidis and Eleni Diamanti
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Anna Pappa: LTCI, CNRS—Télécom ParisTech
Paul Jouguet: LTCI, CNRS—Télécom ParisTech
Thomas Lawson: LTCI, CNRS—Télécom ParisTech
André Chailloux: INRIA Paris-Rocquencourt, Domaine de Voluceau
Matthieu Legré: ID Quantique SA, 3, Chemin de la Marbrerie
Patrick Trinkler: ID Quantique SA, 3, Chemin de la Marbrerie
Iordanis Kerenidis: LIAFA, CNRS—Université Paris Diderot 7
Eleni Diamanti: LTCI, CNRS—Télécom ParisTech

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Performing complex cryptographic tasks will be an essential element in future quantum communication 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 and play system, developed by significantly enhancing a commercial quantum key distribution device. Moreover, we provide combined quantum coin flipping protocols that are almost perfectly secure against bounded adversaries. Our results offer a useful toolbox for future secure quantum communications.

Date: 2014
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DOI: 10.1038/ncomms4717

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