{
  "abstract": "We report an improved absolute frequency measurement of the $^{176}$Lu$^+\\,(^{3}\\mathrm{D}_1)$ optical frequency standard, evaluated via a remote link to the NRC-FCs2 caesium fountain primary frequency standard. Operating a single ion clock with 94.2% uptime over 10 days, and using an ambiguity-resolved precise point positioning (PPP-AR) link over the Global Positioning System, we determine an absolute frequency of $353\\,638\\,794\\,073\\,800.332(91)\\,$Hz at a fractional uncertainty of $2.6 \\times 10^{-16}$. This agrees with our previous result, which underpins the Comité international des poids et mesures recommended frequency value, and reduces the uncertainty by a factor of 3.6.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Metrologia 63, 055005 (2026)",
  "arxiv": "2607.07044",
  "author_total": 9,
  "authors": [
    {
      "name": "K. J. Arnold"
    },
    {
      "name": "Bin Jian"
    },
    {
      "name": "Zhao Zhang"
    },
    {
      "name": "Qi Zhao"
    },
    {
      "name": "Qin Qichen"
    },
    {
      "name": "N. Jayjong"
    },
    {
      "name": "M. D. K. Lee"
    },
    {
      "name": "Scott Beattie"
    },
    {
      "name": "M. D. Barrett"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1ewnxfnf67skh.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.07044",
  "fulltext_url": null,
  "id": "1ewnxfnf67skh",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.07044",
  "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/2607.07044",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1ewnxfnf67skh.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2607.07044",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.07044"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.atom-ph",
      "subfield": "amo"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Absolute frequency measurement of a $^{176}$Lu$^+\\,(^{3}\\mathrm{D}_1)$ standard against the NRC-FCs2 fountain with $2.6\\times10^{-16}$ uncertainty",
  "title_text": "Absolute frequency measurement of a ^176Lu^+ (^3D_1) standard against the NRC-FCs2 fountain with 2.6×10^−16 uncertainty",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/1ewnxfnf67skh",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1088/1681-7575/aea166",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}