{
  "annotation_id": "212baac3-571c-4470-87e4-669ad9076e04",
  "date_created": "2026-03-02T18:01:42.186000Z",
  "date_modified": "2026-03-02T18:01:42.186000Z",
  "file_hash": "f445d1f68f9c84cc5b68f8ae4ebc52a506e4bf565519ecf46e1b264f274aa2d8",
  "private": false,
  "record": {
    "abstract": "We describe a purely algebraic method for finding the best separable\napproximation to a mixed state of a composite 2x2 quantum system, consisting of\na decomposition of the state into a linear combination of a mixed separable\npart and a pure entangled one. We prove that, in a generic case, the weight of\nthe pure part in the decomposition equals the concurrence of the state.",
    "arxiv_id": "quant-ph/0104098",
    "authors": [
      "Thomas Wellens",
      "Marek Kus"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.64.052302",
    "title": "Separable approximation for mixed states of composite quantum systems",
    "url": "https://arxiv.org/abs/quant-ph/0104098"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "04b51feb-3b66-4c36-a394-5990f8764c0b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}