{
  "annotation_id": "430598df-3a07-4c1a-b3c2-04283a926687",
  "date_created": "2026-03-02T18:00:47.012000Z",
  "date_modified": "2026-03-02T18:00:47.012000Z",
  "file_hash": "97626445d8fd2ec49265ab2725f633f16b34329360a53aa14497ee552ad34bf9",
  "private": false,
  "record": {
    "abstract": "We numerically evaluate the expected performances of an optical frequency\nstandard at 729 nm based on a single calcium ion. The frequency stability is\nstudied through the Allan deviation and its dependence on the excitation method\n(single Rabi pulse or two Ramsey pulses schemes) and the laser linewidth are\ndiscussed. The minimum Allan deviation that can be expected is estimated to\n$\\sigma_y(\\tau) \\approx 2.5\\times 10^{-15}/\\sqrt{\\tau}$ with $\\tau$ the\nintegration time. The frequency shifts induced by the environmental conditions\nare evaluated to minimize the uncertainty of the proposed standard by chosing\nthe most suited environment for the ion. If using the odd isotope\n$^{43}$Ca$^{+}$ and a vessel cooled to 77 K, the expected relative shift is $-2\n\\times 10^{-16}$ with an uncertainty of $\\pm 4\\times10^{-16}$, mainly due to\nthe quadrupole shift induced by the unknown static electric field gradient .",
    "arxiv_id": "physics/0312120",
    "authors": [
      "Caroline Champenois",
      "Marie Houssin",
      "Caroline Lisowski",
      "Martina Knoop",
      "Gaetan Hagel",
      "Michel Vedel",
      "Fernande Vedel"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1016/j.physleta.2004.09.008",
    "title": "Evaluation of the ultimate performances of a Ca+ single-ion frequency   standard",
    "url": "https://arxiv.org/abs/physics/0312120"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "62a7cf95-8515-443c-b7ba-4ee81721a172",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}