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Practical device-independent quantum cryptography via entropy accumulation

Arnon-Friedman, Rotem and Dupuis, Frédéric and Fawzi, Omar and Renner, Renato and Vidick, Thomas (2018) Practical device-independent quantum cryptography via entropy accumulation. Nature Communications, 9 . Art. No. 459. ISSN 2041-1723. PMCID PMC5792631. doi:10.1038/s41467-017-02307-4.

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Device-independent cryptography goes beyond conventional quantum cryptography by providing security that holds independently of the quality of the underlying physical devices. Device-independent protocols are based on the quantum phenomena of non-locality and the violation of Bell inequalities. This high level of security could so far only be established under conditions which are not achievable experimentally. Here we present a property of entropy, termed “entropy accumulation”, which asserts that the total amount of entropy of a large system is the sum of its parts. We use this property to prove the security of cryptographic protocols, including device-independent quantum key distribution, while achieving essentially optimal parameters. Recent experimental progress, which enabled loophole-free Bell tests, suggests that the achieved parameters are technologically accessible. Our work hence provides the theoretical groundwork for experimental demonstrations of device-independent cryptography.

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Vidick, Thomas0000-0002-6405-365X
Additional Information:© 2018 Macmillan Publishers. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit Received: 11 July 2017. Accepted: 20 November 2017. Published online: 31 January 2018. We thank Asher Arnon for the illustrations presented in Figs. 1, 4, and 5. R.A.F. and R.R. were supported by the Stellenbosch Institute for Advanced Study (STIAS), by the European Commission via the project “RAQUEL”, by the Swiss National Science Foundation (grant No. 200020–135048) and the National Centre of Competence in Research “Quantum Science and Technology”, by the European Research Council (grant No. 258932), and by the US Air Force Office of Scientific Research (grant No. FA9550-16-1-0245). F.D. acknowledges the financial support of the Czech Science Foundation (GA ČR) project no GA16-22211S and of the European Commission FP7 Project RAQUEL (grant No. 323970). O.F. acknowledges support from the LABEX MILYON (ANR-10-LABX-0070) of Université de Lyon, within the program “Investissements d’Avenir” (ANR-11-IDEX-0007) operated by the French National Research Agency (ANR). T.V. was partially supported by NSF CAREER Grant CCF-1553477, an AFOSR YIP award, the IQIM, and NSF Physics Frontiers Center (NFS Grant PHY-1125565) with support of the Gordon and Betty Moore Foundation (GBMF-12500028). Data availability: No data sets were generated or analysed during the current study. Author Contributions: R.A.F., F.D., O.F., R.R., and T.V. contributed equally to this work. The authors declare that they have no competing financial interests.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Stellenbosch Institute for Advanced Study (STIAS)UNSPECIFIED
Swiss National Science Foundation (SNSF)200020-135048
European Research Council (ERC)258932
Air Force Office of Scientific Research (AFOSR)FA9550-16-1-0245
Czech Science FoundationGA16-22211S
European Research Council (ERC)323970
Agence Nationale pour la Recherche (ANR)ANR-10-LABX-0070
Agence Nationale pour la Recherche (ANR)ANR-11-IDEX-0007
Gordon and Betty Moore FoundationGBMF-12500028
PubMed Central ID:PMC5792631
Record Number:CaltechAUTHORS:20180130-110708768
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84579
Deposited By: Joy Painter
Deposited On:31 Jan 2018 16:14
Last Modified:17 Mar 2022 17:27

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