{
  "annotation_id": "f2a53cbc-f686-431e-8735-0c5f92dbe3bd",
  "date_created": "2026-03-02T18:00:35.513000Z",
  "date_modified": "2026-03-02T18:00:35.513000Z",
  "file_hash": "36ca31d111810fe65063584b7f986d5411f2a087b4d59b5ec55da1e4d221e3f1",
  "private": false,
  "record": {
    "abstract": "We have measured the frequency of the $6s^2S_{1/2} - 5d^2D_{3/2}$\nelectric-quadrupole transition of $^{171}$Yb$^+$ with a relative uncertainty of\n$1\\times 10^{-14}$, $\\nu_{Yb}$ = 688 358 979 309 312 Hz $\\pm$ 6 Hz. A\nfemtosecond frequency comb generator was used to phase-coherently link the\noptical frequency derived from a single trapped ion to a cesium fountain\ncontrolled hydrogen maser. This measurement is one of the most accurate\nmeasurements of optical frequencies ever reported, and it represents a\ncontribution to the development of optical clocks based on an $^{171}$Yb$^+$\nion standard.",
    "arxiv_id": "physics/0103040",
    "authors": [
      "Joern Stenger",
      "Christian Tamm",
      "Nils Haverkamp",
      "Stefan Weyers",
      "Harald R. Telle"
    ],
    "categories": [
      "physics.optics"
    ],
    "doi": "10.1364/OL.26.001589",
    "title": "Absolute frequency measurement of the 171Yb+ clock transition with a   Kerr-lens mode-locked femtosecond laser",
    "url": "https://arxiv.org/abs/physics/0103040"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4fccdb2c-7027-4854-b469-ffe9133068d2",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}