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)

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