{
  "annotation_id": "97055e84-e232-4856-9d53-16abcad51f16",
  "date_created": "2026-03-02T18:01:59.472000Z",
  "date_modified": "2026-03-02T18:01:59.472000Z",
  "file_hash": "c46b88841dc3b4274935b333b36e6a079a1a38565234c2732fbd7033c1458e58",
  "private": false,
  "record": {
    "abstract": "In this letter we present a method for increasing the coherence time of\npraseodymium hyperfine ground state transitions in Pr^3+:Y_2SiO_5 by the\napplication of a specific external magnetic field. The magnitude and angle of\nthe external field is applied such that the Zeeman splitting of a hyperfine\ntransition is at a critical point in three dimensions, making the first order\nZeeman shift vanishingly small for the transition. This reduces the influence\nof the magnetic interactions between the praseodymium ions and the spins in the\nhost lattice on the transition frequency. Using this method a phase memory time\nof 82ms was observed, a value two orders of magnitude greater than previously\nreported. It is shown that the residual dephasing is amenable quantum error\ncorrection.",
    "arxiv_id": "quant-ph/0306169",
    "authors": [
      "E. Fraval",
      "M. J. Sellars",
      "J. J. Longdell"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.92.077601",
    "title": "Method of extending hyperfine coherence times in Pr^3+:Y_2SiO_5",
    "url": "https://arxiv.org/abs/quant-ph/0306169"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2f49964c-fd65-468e-a788-51d92dd44092",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}