Clifford-group-restricted eavesdroppers in quantum key distribution
Name
PhysRevA.101.062318.pdf
Description
Published version
Size
400.35 KB
Format
Adobe PDF
Checksum (MD5)
b2c28ea0898c549742a7db5ed6ab6850
Author(s)
Bunandar, Darius
Englund, Dirk R.
Date Issued
June 2020
Journal
Physical Review A
Publisher
American Physical Society (APS)
Citation
Govia, L. C. G. et al. “Clifford-group-restricted eavesdroppers in quantum key distribution.” Physical Review A, 101, 6 (June 2020): 062318 © 2020 The Author(s)
Version
Final published version
Abstract
Quantum key distribution (QKD) promises provably secure cryptography, even to attacks from an all-powerful adversary. However, with quantum computing development lagging behind QKD, the assumption that there exists an adversary equipped with a universal fault-tolerant quantum computer is unrealistic for at least the near-future. Here, we explore the effect of restricting the eavesdropper's computational capabilities on the security of QKD and find that improved secret key rates are possible. Specifically, we show that for a large class of discrete variable protocols higher key rates are possible if the eavesdropper is restricted to a unitary operation from the Clifford group. Further, we consider Clifford-random channels consisting of mixtures of Clifford gates. We numerically calculate a secret-key-rate lower bound for BB84 with this restriction and show that, in contrast to the case of a single restricted unitary attack, the mixture of Clifford-based unitary attacks does not result in an improved key rate.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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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.101.062318
