Experimental quantum fingerprinting with weak coherent pulses

Feihu Xu, Juan Miguel Arrazola, Kejin Wei, Wenyuan Wang, Pablo Palacios-Avila, Chen Feng, Shihan Sajeed, Norbert Lütkenhaus () and Hoi-Kwong Lo ()
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Feihu Xu: Center for Quantum Information and Quantum Control, University of Toronto
Juan Miguel Arrazola: Institute for Quantum Computing, University of Waterloo
Kejin Wei: Center for Quantum Information and Quantum Control, University of Toronto
Wenyuan Wang: Center for Quantum Information and Quantum Control, University of Toronto
Pablo Palacios-Avila: Institute for Quantum Computing, University of Waterloo
Chen Feng: School of Engineering, University of British Columbia
Shihan Sajeed: Institute for Quantum Computing, University of Waterloo
Norbert Lütkenhaus: Institute for Quantum Computing, University of Waterloo
Hoi-Kwong Lo: Center for Quantum Information and Quantum Control, University of Toronto

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract Quantum communication holds the promise of creating disruptive technologies that will play an essential role in future communication networks. For example, the study of quantum communication complexity has shown that quantum communication allows exponential reductions in the information that must be transmitted to solve distributed computational tasks. Recently, protocols that realize this advantage using optical implementations have been proposed. Here we report a proof-of-concept experimental demonstration of a quantum fingerprinting system that is capable of transmitting less information than the best-known classical protocol. Our implementation is based on a modified version of a commercial quantum key distribution system using off-the-shelf optical components over telecom wavelengths, and is practical for messages as large as 100 Mbits, even in the presence of experimental imperfections. Our results provide a first step in the development of experimental quantum communication complexity.

Date: 2015
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DOI: 10.1038/ncomms9735

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