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Long-distance quantum key distribution using concatenated entanglement swapping with practical resources

Khalique, Aeysha and Sanders, Barry C. (2017) Long-distance quantum key distribution using concatenated entanglement swapping with practical resources. Optical Engineering, 56 (1). Art. no. 016114. ISSN 0091-3286. doi:10.1117/1.OE.56.1.016114.

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We explain how to share photons between two distant parties using concatenated entanglement swapping and assess performance according to the two-photon visibility as the figure of merit. From this analysis, we readily see the key generation rate and the quantum bit error rate as figures of merit for this scheme applied to quantum key distribution (QKD). Our model accounts for practical limitations, including higher-order photon pair events, dark counts, detector inefficiency, and photon losses. Our analysis shows that compromises are needed among the runtimes for the experiment, the rate of producing photon pairs, and the choice of detector efficiency. From our quantitative results, we observe that concatenated entanglement swapping enables secure QKD over long distances but at key generation rates that are far too low to be useful for large separations. We find that the key generation rates are close to both the Takeoka–Guha–Wilde and the Pirandola–Laurenza–Ottaviani–Banchi bounds.

Item Type:Article
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Sanders, Barry C.0000-0002-8326-8912
Additional Information:© 2017 Society of Photo-Optical Instrumentation Engineers. Received October 20, 2016; Accepted January 5, 2017. We thank Wolfgang Tittel, Michael Lamoreux, Artur Scherer, Norbert Lütkenhaus, and Pengqing Zhang for valuable discussions. BCS appreciates financial support provided by NSERC, Alberta Innovates Technology Futures, China’s 1000 Talent Plan, and by the Institute for Quantum Information and Matter, which is a National Science Foundation Physics Frontiers Center (NSF Grant PHY-1125565) with support of the Gordon and Betty Moore Foundation (GBMF-2644). This research has been enabled by the use of computing resources provided by WestGrid and Compute/Calcul Canada.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Alberta Innovates Technology FuturesUNSPECIFIED
China’s 1000 Talent PlanUNSPECIFIED
Gordon and Betty Moore FoundationGBMF-2644
Issue or Number:1
Record Number:CaltechAUTHORS:20170330-164934833
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Official Citation:Aeysha Khalique and Barry C. Sanders "Long-distance quantum key distribution using concatenated entanglement swapping with practical resources", Opt. Eng. 56(1), 016114 (Jan 25, 2017). ;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75561
Deposited By: George Porter
Deposited On:31 Mar 2017 15:03
Last Modified:15 Nov 2021 16:34

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