{
  "annotation_id": "989521d2-f373-4b2b-8b5f-7ffeb1b1fe7b",
  "date_created": "2026-03-02T18:02:15.961000Z",
  "date_modified": "2026-03-02T18:02:15.961000Z",
  "file_hash": "a566f08a559f6470a3f6ec24ef57527fda06ae1da699cae64a5b705e68a722ed",
  "private": false,
  "record": {
    "abstract": "We demonstrate experimentally a robust quantum memory using a\nmagnetic-field-independent hyperfine transition in 9Be+ atomic ion qubits at a\nmagnetic field B ~= 0.01194 T. We observe that the single physical qubit memory\ncoherence time is greater than 10 seconds, an improvement of approximately five\norders of magnitude from previous experiments with 9Be+. We also observe long\ncoherence times of decoherence-free subspace logical qubits comprising two\nentangled physical qubits and discuss the merits of each type of qubit.",
    "arxiv_id": "quant-ph/0504076",
    "authors": [
      "C. Langer",
      "R. Ozeri",
      "J. D. Jost",
      "J. Chiaverini",
      "B. DeMarco",
      "A. Ben-Kish",
      "R. B. Blakestad",
      "J. Britton",
      "D. B. Hume",
      "W. M. Itano",
      "D. Leibfried",
      "R. Reichle",
      "T. Rosenband",
      "T. Schaetz",
      "P. O. Schmidt",
      "D. J. Wineland"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.95.060502",
    "title": "Long-lived qubit memory using atomic ions",
    "url": "https://arxiv.org/abs/quant-ph/0504076"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f213f52a-2496-44b0-a05a-c33599caa11e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}