{
  "annotation_id": "3c3bac25-1565-47bc-a8fe-9f4b4e35dcb7",
  "date_created": "2026-03-02T18:01:42.411000Z",
  "date_modified": "2026-03-02T18:01:42.411000Z",
  "file_hash": "f26493f94f4edd2f58e78b87d0029929137db3ba0968000a44d4be7b996def33",
  "private": false,
  "record": {
    "abstract": "We consider mixed states of two qubits and show under which global unitary\noperations their entanglement is maximized. This leads to a class of states\nthat is a generalization of the Bell states. Three measures of entanglement are\nconsidered: entanglement of formation, negativity and relative entropy of\nentanglement. Surprisingly all states that maximize one measure also maximize\nthe others. We will give a complete characterization of these generalized Bell\nstates and prove that these states for fixed eigenvalues are all equivalent\nunder local unitary transformations. We will furthermore characterize all\nnearly entangled states closest to the maximally mixed state and derive a new\nlower bound on the volume of separable mixed states.",
    "arxiv_id": "quant-ph/0011110",
    "authors": [
      "Frank Verstraete",
      "Koenraad Audenaert",
      "Tijl De Bie",
      "Bart De Moor"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.64.012316",
    "journal_ref": "Phys. Rev. A (\\bf 64), 012316 (2001)",
    "title": "Maximally entangled mixed states of two qubits",
    "url": "https://arxiv.org/abs/quant-ph/0011110"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "dbd055fa-602e-4445-ac74-b95af6d02aea",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}