{
  "abstract": "We report a laser with record frequency stability, based on a 21 cm cryogenic silicon cavity. For best short-term stability, the cavity operates at 6 K to minimize Brownian thermal noise and achieves a fractional stability of $7\\times10^{-18}$ between 2 to 50 s of averaging time and 2.5 mHz linewidth. For best long-term stability the cavity operates at 16 K, where silicon has a zero-crossing of thermal expansion. Slightly increased thermal noise limits the performance to $9\\times10^{-18}$, consistent with the expected temperature scaling, but the long-term performance is improved. The laser then has a linewidth of 2.9 mHz and long-term frequency drift less than 4 μHz s$^{-1}$. The laser is used to enhance the performance of a state-of-the-art Sr lattice clock, operating with Rabi and Ramsey interrogation times beyond 10 s.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.30532",
  "author_total": 11,
  "authors": [
    {
      "name": "Ben Lewis"
    },
    {
      "name": "Zoey Z. Hu"
    },
    {
      "name": "Dahyeon Lee"
    },
    {
      "name": "Kyungtae Kim"
    },
    {
      "name": "William Warfield"
    },
    {
      "name": "Kai Zhou"
    },
    {
      "name": "Daniele Nicolodi"
    },
    {
      "name": "Thomas Legero"
    },
    {
      "name": "Uwe Sterr"
    },
    {
      "name": "Fritz Riehle"
    },
    {
      "name": "Jun Ye"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1b09zrgkaj8vv.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.30532",
  "fulltext_url": null,
  "id": "1b09zrgkaj8vv",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.30532",
  "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",
      "physics.optics"
    ],
    [
      "openalex",
      "3107|Advanced Frequency and Time Standards"
    ]
  ],
  "openalex": "W7223404457",
  "pdf_url": "https://arxiv.org/pdf/2610.30532",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1b09zrgkaj8vv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:34Z",
      "native_id": "2610.30532",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.30532"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Laser with $7\\times10^{-18}$ stability",
  "title_text": "Laser with 7×10^−18 stability",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:34Z",
  "url": "https://research.draconitic.com/paper/1b09zrgkaj8vv",
  "venue": "arXiv",
  "versions": []
}