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Robust Quantum Key Distribution Arbitrarily Close to Local Correlations — arXiv:2608.22603

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.22603
License (as archived): CC0-1.0
Archived: 2026-10-18T09:35:18.381Z
SHA-256 of the archived text: 58a94efe227c2c6dda264287cdbb2f97acb8c20b63212ada5124a13b1de46549
Stable URL of this page: https://metraipolis.com/documento/dc_cf4e75b7d7fc

How to cite

Robust Quantum Key Distribution Arbitrarily Close to Local Correlations — arXiv:2608.22603 — arXiv (en), https://arxiv.org/abs/2608.22603 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_cf4e75b7d7fc (Metraipolis archive dc_cf4e75b7d7fc, sha256 58a94efe227c2c6dda264287cdbb2f97acb8c20b63212ada5124a13b1de46549)

BibTeX

@misc{dccf4e75b7d7fc,
  title = {Robust Quantum Key Distribution Arbitrarily Close to Local Correlations — arXiv:2608.22603},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.22603},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_cf4e75b7d7fc; sha256 58a94efe227c2c6dda264287cdbb2f97acb8c20b63212ada5124a13b1de46549},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.22603. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Recently, Wooltorton et al. [Phys. Rev. Lett. 132, 210802 (2024)] and Farkas [Phys. Rev. Lett. 132, 210803 (2024)] have exhibited the mismatch between Bell inequality violations and their cryptographic application in device-independent quantum key distribution, by showing that arbitrarily close to the set of local behaviours there exist quantum correlations guaranteeing a constant rate of secret key. While these results require correlations attaining the maximum quantum value of a suitable Bell observable (aka the Tsirelson bound) and rely on a kind of ideal self-testing of a maximally entangled state and associated Bell measurement, here we show that the effect is robust: for every one of the Bell inequalities considered by Wooltorton \emph{et al.}, a constant rate of secret key ensues if the observed Bell violation is sufficiently close to the respective Tsirelson bound. For these and also the Bell inequalities of Farkas, we furthermore present numerical results based on semidefinite relaxations of the minimum min-entropy consistent with a certain Bell violation, which demonstrate that small but nonzero key rates can be guaranteed (in principle) by practical and efficient means.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-08-25 in quant-ph).
Categorie arXiv: Quantum Physics (quant-ph).
Pagina del lavoro: https://arxiv.org/abs/2608.22603 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-18T09:27:54.389Z dalla pagina https://arxiv.org/catchup/quant-ph/2026-08-25?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).