{
  "annotation_id": "5d3d0215-281f-45b9-bee5-60a94ac56c98",
  "date_created": "2026-03-02T18:01:38.674000Z",
  "date_modified": "2026-03-02T18:01:38.674000Z",
  "file_hash": "9fa870e37ae700effb056747e3dc741525c5556fa253b753851d69638b7e05f3",
  "private": false,
  "record": {
    "abstract": "We propose novel mixed states in two qubits, ``maximally entangled mixed\nstates\u0027\u0027, which have a property that the amount of entanglement of these states\ncannot be increased further by applying any unitary operations. The property is\nproven when the rank of the states is less than 4, and confirmed numerically in\nthe other general cases. The corresponding entanglement of formation specified\nby its eigenvalues gives an upper bound of that for density matrices with same\neigenvalues.",
    "arxiv_id": "quant-ph/0003023",
    "authors": [
      "Satoshi Ishizaka",
      "Tohya Hiroshima"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.62.022310",
    "journal_ref": "Phys. Rev. A 62, 022310 (2000)",
    "title": "Maximally entangled mixed states in two qubits",
    "url": "https://arxiv.org/abs/quant-ph/0003023"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "33a768f8-f91e-4ca8-bc41-617e0b6f5301",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}