{
  "annotation_id": "f1151549-9f9a-4d61-b7dd-ef21be9a5333",
  "date_created": "2026-03-02T18:01:48.280000Z",
  "date_modified": "2026-03-02T18:01:48.280000Z",
  "file_hash": "10307c30b8d4f0a7352a7deef6b9cc8961c3e6b787ee1e895fc72d1479f2cd93",
  "private": false,
  "record": {
    "abstract": "It is shown that, despite strong nonlinearity, entanglement of formation of\ntwo-qubit state can be measured without prior state reconstruction. Collective\nmeasurements on small number of copies are provided that allow to determine\nquantum concurrence {\\it via} estimation of only {\\it four} parameters. It is\nalso pointed out that another entanglement measure based on so called\nnegativity can also be measured in similar way. The result is related to\ngeneral problem: what kind of information can be extracted efficiently from\nunknown quantum state ?",
    "arxiv_id": "quant-ph/0111082",
    "authors": [
      "Pawel Horodecki"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Measuring quantum entanglement without prior state reconstruction",
    "url": "https://arxiv.org/abs/quant-ph/0111082"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4462c40d-d5a7-4de1-983b-ffeec3d08361",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}