{
  "abstract": "Here we report atomic structure calculations and experimental observations of the two-photon $6s^2\\;^1S_0 \\rightarrow 6s23s\\;^1S_0$ transition in Yb. The unique level structure of Yb places the $6s6p\\;^1P_1$ state's energy at $\\approx\\!49.7\\%$ of the ionization energy, which facilitates two-photon Doppler-free excitation of the $6s23s\\;^1S_0$ Rydberg state from the $6s^2\\;^1S_0$ ground state at a relatively low optical intensity. This $J= 0 \\rightarrow J=0$ transition is immune to first-order Zeeman and electric quadrupole shifts, has reduced sensitivity to higher-order Zeeman shifts, and is further predicted to have relatively low sensitivity to density shifts. Using configuration interaction theory, we compute relevant properties of the $6s23s\\;^1S_0$ Rydberg state for sensing, including the $C_6$ coefficient, dc polarizability, blackbody radiation (BBR) shift, and BBR depopulation rate. As a first experimental step, we demonstrate two-photon Doppler-free spectroscopy of the $6s^2\\;^1S_0 \\rightarrow 6s23s\\;^1S_0$ transition. From our experimental spectra, we estimate the natural linewidth (lifetime) of the $6s23s\\;^1S_0$ state to be 90 kHz (1.8 $μ$s). We believe this transition, or other $6s^2\\;^1S_0 \\rightarrow 6sns\\;^1S_0$ transitions in Yb with $n\\approx23$, may find use in a variety of sensing applications, potentially including a two-photon clock, electrometer, or BBR thermometer.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Phys. Rev. A 114, 042818 (2026)",
  "arxiv": "2610.22574",
  "author_total": 8,
  "authors": [
    {
      "name": "Benjamin D. Hunt"
    },
    {
      "name": "Kyle Beloy"
    },
    {
      "name": "Roger C. Brown"
    },
    {
      "name": "Tobias Bothwell"
    },
    {
      "name": "Harikesh Ranganath"
    },
    {
      "name": "Tanner Grogan"
    },
    {
      "name": "Jacob L. Siegel"
    },
    {
      "name": "Andrew Ludlow"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a35324gsjb58w.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.22574",
  "fulltext_url": null,
  "id": "a35324gsjb58w",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.22574",
  "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"
    ],
    [
      "openalex",
      "3107|Advanced Frequency and Time Standards"
    ]
  ],
  "openalex": "W7222945219",
  "pdf_url": "https://arxiv.org/pdf/2610.22574",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a35324gsjb58w.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:50Z",
      "native_id": "2610.22574",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.22574"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.atom-ph",
      "subfield": "amo"
    }
  ],
  "title": "Two-photon Doppler-free spectroscopy of the $6s^2\\;^1S_0 \\rightarrow 6s23s\\;^1S_0$ Rydberg transition for quantum sensing in ytterbium",
  "title_text": "Two-photon Doppler-free spectroscopy of the 6s^2 ^1S_0 → 6s23s ^1S_0 Rydberg transition for quantum sensing in ytterbium",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:50Z",
  "url": "https://research.draconitic.com/paper/a35324gsjb58w",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/v16l-synk",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}