{
  "abstract": "Concatenation of quantum repeater nodes has been proposed as a means to distribute entanglement efficiently across future long-distance networks. Here, we demonstrate a trapped-ion repeater node that establishes photonic entanglement over a 17 km fiber traversing a city, moving beyond laboratory-only prototypes. The node comprises two atomic ions coupled to an optical cavity. First, a detailed characterization is performed of the long fiber channel and of ion-photon entanglement distributed across it. Next, a repeater-node protocol is implemented, achieving entanglement between a local photon and a remote photon with a Bell-state fidelity of $81.6^{+1.9}_{-1.4}\\%$. These results demonstrate that trapped-ion repeater-node technology can operate over existing city-scale fiber infrastructure and represent a step toward distributed quantum repeater networks.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.27854",
  "author_total": 10,
  "authors": [
    {
      "name": "K. Fabitha"
    },
    {
      "name": "T. Runggaldier"
    },
    {
      "name": "A. Winkler"
    },
    {
      "name": "F. Bernecker"
    },
    {
      "name": "J. Bate"
    },
    {
      "name": "M. Canteri"
    },
    {
      "name": "J. Helgert"
    },
    {
      "name": "T. E. Northup"
    },
    {
      "name": "V. Krutyanskiy"
    },
    {
      "name": "B. P. Lanyon"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c9g241am9sdwk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.27854",
  "fulltext_url": null,
  "id": "c9g241am9sdwk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.27854",
  "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",
      "quant-ph"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7223129208",
  "pdf_url": "https://arxiv.org/pdf/2610.27854",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/c9g241am9sdwk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.27854",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.27854"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Trapped-ion-based quantum repeater node across a 17 km metropolitan fiber",
  "title_text": "Trapped-ion-based quantum repeater node across a 17 km metropolitan fiber",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/c9g241am9sdwk",
  "venue": "arXiv",
  "versions": []
}