{
  "annotation_id": "bce9a750-5f15-4787-a037-84fe1d00c4e4",
  "date_created": "2026-03-02T18:01:56.455000Z",
  "date_modified": "2026-03-02T18:01:56.455000Z",
  "file_hash": "186a9f20c42cc60539e997b0535d07df0d79636c6d5023256b248343f81c8334",
  "private": false,
  "record": {
    "abstract": "Two-level ionic systems, where quantum information is encoded in long lived\nstates (qubits), are discussed extensively for quantum information processing.\nWe present a collection of measurements which characterize the stability of a\nqubit based on the $S_{1/2}$--$D_{5/2}$ transition of single $^{40}$Ca$^+$ ions\nin a linear Paul trap. We find coherence times of $\\simeq$1 ms, discuss the\nmain technical limitations and outline possible improvements.",
    "arxiv_id": "quant-ph/0211059",
    "authors": [
      "F. Schmidt-Kaler",
      "S. Gulde",
      "M. Riebe",
      "T. Deuschle",
      "A. Kreuter",
      "G. Lancaster",
      "C. Becher",
      "J. Eschner",
      "H. Haeffner",
      "R. Blatt"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/0953-4075/36/3/319",
    "title": "Coherence of qubits based on single Ca$^+$ ions",
    "url": "https://arxiv.org/abs/quant-ph/0211059"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "7150ed48-254b-4d5e-be7d-632d8f8cab4e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}