{
  "annotation_id": "3ffb4124-c835-4ab0-9554-6d30cb8bc902",
  "date_created": "2026-03-02T18:02:47.708000Z",
  "date_modified": "2026-03-02T18:02:47.708000Z",
  "file_hash": "5a3425828fc7499a94e230befa4262ec3a1e3c29688bb66ef5c8864eeefee24a",
  "private": false,
  "record": {
    "abstract": "How much information about an unknown quantum state can be obtained by a\nmeasurement? We propose a model independent answer: the information obtained is\nequal to the minimum entropy of the outputs of the measurement, where the\nminimum is taken over all measurements which measure the same ``property\u0027\u0027 of\nthe state. This minimization is necessary because the measurement outcomes can\nbe redundant, and this redundancy must be eliminated. We show that this minimum\nentropy is less or equal than the von Neumann entropy of the unknown states.\nThat is a measurement can extract at most one meaningful bit from every qubit\ncarried by the unknown states.",
    "arxiv_id": "quant-ph/9907066",
    "authors": [
      "S. Massar",
      "S. Popescu"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.61.062303",
    "journal_ref": "Phys.Rev. A61 (2000) 062303",
    "title": "How much information can be obtained by a quantum measurement?",
    "url": "https://arxiv.org/abs/quant-ph/9907066"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c8fb1960-1f8b-44f3-85c1-8164fef7650e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}