Walton, A orcid.org/0000-0003-0852-2762, Ghesquière, A orcid.org/0000-0003-1595-7473, Brumpton, G et al. (2 more authors) (Cover date: 22 September 2021) Thermal state quantum key distribution. Journal of Physics B: Atomic, Molecular and Optical Physics, 54 (18). 185501. ISSN 0953-4075
Abstract
We analyse a central broadcast continuous variable quantum key distribution protocol in which a beam produced by a thermal source is used to create a secret key between two parties, Alice and Bob. A beam splitter divides the initial beam into a pair of output beams, which are sent to Alice and Bob, with Eve intercepting Bob's beam. We investigate the protocol in detail, calculating mutual informations through a pair of analytic methods and comparing the results to the outputs of a Monte Carlo simulation of the protocol. In a lossless system, we find that a lower bound on the key rate remains positive in the protocol under a beam splitter attack, provided Bob receives a nonzero proportion of the beam initially sent to him. This suggests that the thermal state protocol could be used experimentally to produce secure keys.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 The Author(s). Published by IOP Publishing Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
Keywords: | thermal states, QKD, key distribution, continuous variables, correlation, computing, quantum key distribution |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Theoretical Physics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 02 Nov 2021 12:48 |
Last Modified: | 08 Jan 2025 14:20 |
Published Version: | http://dx.doi.org/10.1088/1361-6455/ac2a6e |
Status: | Published |
Publisher: | IOP Publishing |
Identification Number: | 10.1088/1361-6455/ac2a6e |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:179659 |
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Filename: Walton_2021_J._Phys._B__At._Mol._Opt._Phys._54_185501.pdf
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