Security of high-dimensional quantum key distribution protocols using Franson interferometers

Brougham, T., Barnett, S.M. , McCusker, K.T., Kwiat, P.G. and Gauthier, D.J. (2013) Security of high-dimensional quantum key distribution protocols using Franson interferometers. Journal of Physics B: Atomic, Molecular and Optical Physics, 46(10), Art. 104010. (doi:10.1088/0953-4075/46/10/104010)

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Abstract

Franson interferometers are increasingly being proposed as a means of securing high-dimensional energy–time entanglement-based quantum key distribution (QKD) systems. Heuristic arguments have been proposed that purport to demonstrate the security of these schemes. We show, however, that such systems are vulnerable to attacks that localize the photons to several temporally separate locations. This demonstrates that a single pair of Franson interferometers is not a practical approach to securing high-dimensional energy–time entanglement-based QKD. This observation leads us to investigate the security of modified Franson-based-protocols, where Alice and Bob have two or more Franson interferometers. We show that such setups can improve the sensitivity against attacks that localize the photons to multiple temporal locations. While our results do not constitute a full security proof, they do show that a single pair of Franson interferometers is not secure and that multiple such interferometers could be a promising candidate for experimentally realizable high-dimensional QKD.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Barnett, Professor Stephen
Authors: Brougham, T., Barnett, S.M., McCusker, K.T., Kwiat, P.G., and Gauthier, D.J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Physics B: Atomic, Molecular and Optical Physics
Publisher:Institute of Physics
ISSN:0953-4075
ISSN (Online):1361-6455
Copyright Holders:Copyright © 2013 IOP Publishing Ltd.
First Published:First published in Journal of Physics B: Atomic, Molecular and Optical Physics 46(10):104010
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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