{
  "abstract": "Entanglement gives rise to correlations between distant quantum systems that cannot be explained by local realistic theories. Bell inequality violations provide a direct way to reveal these correlations and certify nonlocality, especially when the relevant experimental loopholes are closed. Time-bin encoding, in which quantum information is encoded into well-defined temporal modes, is a commonly used platform for distributing photonic entanglement in optical fibers. Yet loophole-free Bell tests with time-bin entanglement have received comparatively little attention, owing in part to the postselection loophole introduced by conventional interferometric measurements. Here, we demonstrate a fiber-based platform for Bell tests with time-bin entanglement that simultaneously closes the locality, freedom-of-choice, and postselection loopholes. We observe a CHSH violation of $S=2.583 \\pm 0.002$, exceeding the local-realistic bound by over 265 standard deviations. Notably, this rigorous certification of nonlocality is achieved at a separation distance of $49.0 \\pm 0.7$ m, substantially shorter than previous photonic Bell tests addressing comparable space-time constraints. Beyond its foundational significance, our results demonstrate time-bin entanglement as a viable route towards practical device-independent quantum communication and a future quantum internet.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.28190",
  "author_total": 8,
  "authors": [
    {
      "name": "Kannan Vijayadharan"
    },
    {
      "name": "Matías Rubén Bolaños"
    },
    {
      "name": "Andrea Pompermaier"
    },
    {
      "name": "Tommaso Bertapelle"
    },
    {
      "name": "Francesco B. L. Santagiustina"
    },
    {
      "name": "Costantino Agnesi"
    },
    {
      "name": "Giuseppe Vallone"
    },
    {
      "name": "Paolo Villoresi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4e9jcxgmpprw8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.28190",
  "fulltext_url": null,
  "id": "4e9jcxgmpprw8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.28190",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7204787814",
  "pdf_url": "https://arxiv.org/pdf/2608.28190",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4e9jcxgmpprw8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "2608.28190",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.28190"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Postselection-loophole-free Bell test under strict spacetime constraints",
  "title_text": "Postselection-loophole-free Bell test under strict spacetime constraints",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:22Z",
  "url": "https://research.draconitic.com/paper/4e9jcxgmpprw8",
  "venue": "arXiv",
  "versions": []
}