Experimental plug and play quantum coin flipping.
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.
1] LTCI, CNRS-Télécom ParisTech, 23, avenue d'Italie, Paris 75013, France [2] LIAFA, CNRS-Université Paris Diderot 7, Sophie Germain Building, 75205 Paris Cedex 13, France.
Anna
A
Pappa
1] LTCI, CNRS-Télécom ParisTech, 23, avenue d'Italie, Paris 75013, France [2] SeQureNet, 23, avenue d'Italie, Paris 75013, France.
Paul
P
Jouguet
LTCI, CNRS-Télécom ParisTech, 23, avenue d'Italie, Paris 75013, France.
Thomas
T
Lawson
INRIA Paris-Rocquencourt, Domaine de Voluceau, Rocquencourt 78150, France.
André
A
Chailloux
ID Quantique SA, 3, Chemin de la Marbrerie, Carouge/Geneva 1227, Switzerland.
Matthieu
M
Legré
ID Quantique SA, 3, Chemin de la Marbrerie, Carouge/Geneva 1227, Switzerland.
Patrick
P
Trinkler
1] LIAFA, CNRS-Université Paris Diderot 7, Sophie Germain Building, 75205 Paris Cedex 13, France [2] Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.
Iordanis
I
Kerenidis
LTCI, CNRS-Télécom ParisTech, 23, avenue d'Italie, Paris 75013, France.
Eleni
E
Diamanti