{
  "annotation_id": "b9610ae5-2adf-4329-85bf-9250e6f8285b",
  "date_created": "2026-03-02T18:01:59.935000Z",
  "date_modified": "2026-03-02T18:01:59.935000Z",
  "file_hash": "d1f4ea52753f856f27089e193c5a7ed55645b80dadaf8e43374d270f9acfd16a",
  "private": false,
  "record": {
    "abstract": "We propose a directly measurable criterion for the entanglement of two\nqubits. We compare the criterion with other criteria, and we find that for pure\nstates, and some mixed states, it coincides with the state\u0027s concurrency. The\nmeasure can be obtained with a Bell state analyser and the ability to make\ngeneral local unitary transformations. However, the procedure fails to measure\nthe entanglement of a general mixed two-qubit state.",
    "arxiv_id": "quant-ph/0308091",
    "authors": [
      "Hoshang Heydari",
      "Gunnar Bj\u00f6rk",
      "Luis S\u00e1nchez-Soto"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.68.062314",
    "journal_ref": "Phys. Rev. A, vol. 68, pp. 062314/1-4, 2003",
    "title": "A measurable entanglement criterion for two qubits",
    "url": "https://arxiv.org/abs/quant-ph/0308091"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "212319e6-74f7-4927-9ba6-6e3529a26af1",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}