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DOI: 10.4230/LIPIcs.TQC.2023.8

Fully Device-Independent Quantum Key Distribution Using Synchronous Correlations

Authors: Nishant Rodrigues and Brad Lackey

Published in: LIPIcs, Volume 266, 18th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2023)

Abstract

We derive a device-independent quantum key distribution protocol based on synchronous correlations and their Bell inequalities. This protocol offers several advantages over other device-independent schemes including symmetry between the two users and no need for pre-shared randomness. We close a "synchronicity" loophole by showing that an almost synchronous correlation inherits the self-testing property of the associated synchronous correlation. We also pose a new security assumption that closes the "locality" (or "causality") loophole: an unbounded adversary with even a small uncertainty about the users' choice of measurement bases cannot produce any almost synchronous correlation that approximately maximally violates a synchronous Bell inequality.

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Nishant Rodrigues and Brad Lackey. Fully Device-Independent Quantum Key Distribution Using Synchronous Correlations. In 18th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 266, pp. 8:1-8:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{rodrigues_et_al:LIPIcs.TQC.2023.8,
  author =	{Rodrigues, Nishant and Lackey, Brad},
  title =	{{Fully Device-Independent Quantum Key Distribution Using Synchronous Correlations}},
  booktitle =	{18th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2023)},
  pages =	{8:1--8:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-283-9},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{266},
  editor =	{Fawzi, Omar and Walter, Michael},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.TQC.2023.8},
  URN =		{urn:nbn:de:0030-drops-183185},
  doi =		{10.4230/LIPIcs.TQC.2023.8},
  annote =	{Keywords: quantum cryptography, device independence, key distribution, security proofs, randomness}
}

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Fully Device-Independent Quantum Key Distribution Using Synchronous Correlations

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