{
  "annotation_id": "76333a48-e965-4452-8730-486343a1c493",
  "date_created": "2026-03-02T18:02:12.914000Z",
  "date_modified": "2026-03-02T18:02:12.914000Z",
  "file_hash": "bc587ad11890d4d1179910e14c3df158dea09c5ca7017fe3a7569058136bab46",
  "private": false,
  "record": {
    "abstract": "We derived an asymptotic bound the accuracy of the estimation when we use the\nquantum correlation in the measuring apparatus. It is also proved that this\nbound can be achieved in any model in the quantum two-level system. Moreover,\nwe show that this bound of such a model cannot be attained by any quantum\nmeasurement with no quantum correlation in the measuring apparatus. That is, in\nsuch a model, the quantum correlation can improve the accuracy of the\nestimation in an asymptotic setting.",
    "arxiv_id": "quant-ph/0411073",
    "authors": [
      "Masahito Hayashi",
      "Keiji Matsumoto"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Asymptotic performance of optimal state estimation in quantum two level   system",
    "url": "https://arxiv.org/abs/quant-ph/0411073"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f7086c39-0e11-47e0-b4a7-56c4217ee05b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}