{
  "abstract": "Quantum nonlocality, typically revealed through entanglement distribution across quantum networks, is a cornerstone of quantum information science. Long-distance distribution of entanglement requires the information carrier, i.e. flying photons, to operate in the minimum-loss telecom band of optical fiber. While extensive efforts have been devoted to the direct generation of entanglement between C-band telecom photons and various stationary spins, the verification of quantum nonlocality remains an outstanding challenge. Here, utilizing a dipole transition in rubidium atoms with a wavelength of 1530 nm and a cavity-assisted protocol, we achieve resonant excitation and direct emission of C-band telecom photons from a single atom, generating spin-photon entanglement with a measured Bell state fidelity exceeding 91.4%. We then verify Bell nonlocality by observing a Bell inequality violation of 2.455(77) > 2 using this high-quality entangled pair. These results extend the wavelength of a single-atom quantum emitter to the telecom C-band, achieving sufficiently high-fidelity spin-photon entanglement to finally verify Bell nonlocality. This work thereby provides a promising building block for a large-scale atom-based quantum network capable of distributed quantum metrology and long-distance quantum communication.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.08109",
  "author_total": 11,
  "authors": [
    {
      "name": "Dong-Yu Huang"
    },
    {
      "name": "Jian Wang"
    },
    {
      "name": "Xiao-Long Zhou"
    },
    {
      "name": "Ze-Min Shen"
    },
    {
      "name": "Si-Jian He"
    },
    {
      "name": "Qi-Yang Huang"
    },
    {
      "name": "Yi-Jia Liu"
    },
    {
      "name": "Yu-Shu Chen"
    },
    {
      "name": "Quan Jiang"
    },
    {
      "name": "Chuan-Feng Li"
    },
    {
      "name": "Guang-Can Guo"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/37z9k1vjvvvww.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.08109",
  "fulltext_url": null,
  "id": "37z9k1vjvvvww",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.08109",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.atom-ph"
    ],
    [
      "arxiv",
      "quant-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2608.08109",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/37z9k1vjvvvww.ris",
  "sources": [
    {
      "first_seen": "2026-11-10T06:21:04Z",
      "native_id": "2608.08109",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.08109"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.atom-ph",
      "subfield": "amo"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Bell nonlocality with directly generated telecom-band spin-photon entanglement",
  "title_text": "Bell nonlocality with directly generated telecom-band spin-photon entanglement",
  "type": "preprint",
  "updated_at": "2026-11-10T06:21:04Z",
  "url": "https://research.draconitic.com/paper/37z9k1vjvvvww",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1038/s41467-026-79099-z",
      "pid": "3mbg65rz0m4h5",
      "relation": "published-as",
      "title": "Bell nonlocality with directly generated telecom-band spin–photon entanglement",
      "venue": "Nature Communications"
    }
  ]
}