Security-proof framework for two-way Gaussian quantum-key-distribution protocols
Name
PhysRevA.98.032332.pdf
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2.26 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Zhang, Zheshen
Lütkenhaus, Norbert
Shapiro, Jeffrey H.
Zhuang, Quntao
Date Issued
September 2018
Journal
Physical Review A
Publisher
American Physical Society
Citation
Zhuang, Quntao et al. "Security-proof framework for two-way Gaussian quantum-key-distribution protocols." Physical Review A 98, 3 (September 2018): 032332 © 2018 American Physical Society
Version
Final published version
Abstract
Two-way Gaussian protocols have the potential to increase quantum key distribution (QKD) protocols' secret-key rates by orders of magnitudes [Phys. Rev. A 94, 012322 (2016)2469-992610.1103/PhysRevA.94.012322]. Security proofs for two-way protocols, however, are underdeveloped at present. In this paper, we establish a security proof framework for the general coherent attack on two-way Gaussian protocols in the asymptotic regime. We first prove that coherent-attack security can be reduced to collective-attack security for all two-way QKD protocols. Next, we identify two different constraints that each provide intrusion parameters which bound an eavesdropper's coherent-attack information gain for any two-way Gaussian QKD protocol. Finally, we apply our results to two such protocols.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.98.032332
