{
  "annotation_id": "fb8e7fd8-679b-4fa6-b4fe-b556b3adb1d7",
  "date_created": "2026-03-02T18:01:56.068000Z",
  "date_modified": "2026-03-02T18:01:56.068000Z",
  "file_hash": "0bd452f26c6038c8afd70a0dd2c197522cd066fb73413101d3a354ed6c9fbf81",
  "private": false,
  "record": {
    "abstract": "We derive an analytical expression for the lower bound of the concurrence of\nmixed quantum states of composite 2xK systems. In contrast to other, implicitly\ndefined entanglement measures, the numerical evaluation of our bound is\nstraightforward. We explicitly evaluate its tightness for general mixed states\nof 2x3 systems, and identify a large class of states where our expression gives\nthe exact value of the concurrence.",
    "arxiv_id": "quant-ph/0302144",
    "authors": [
      "Artur Lozinski",
      "Andreas Buchleitner",
      "Karol Zyczkowski",
      "Thomas Wellens"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1209/epl/i2003-00342-y",
    "journal_ref": "Europhys. Lett. 62, 168 (2003)",
    "title": "Entanglement of 2xK quantum systems",
    "url": "https://arxiv.org/abs/quant-ph/0302144"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "7eee3802-cfa4-4c8b-88f6-5da146787a60",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}