{
  "annotation_id": "33b75358-8239-4e90-80d6-5a70edc16eff",
  "date_created": "2026-03-02T18:01:48.901000Z",
  "date_modified": "2026-03-02T18:01:48.901000Z",
  "file_hash": "982536397e4e588f5cc6d09ec3d1d42ecffb08931b6132805bceaf889f05056c",
  "private": false,
  "record": {
    "abstract": "We consider a single copy of a mixed state of two qubits and show how its\nfidelity or maximal singlet fraction is related to the entanglement measures\nconcurrence and negativity. We characterize the extreme points of the convex\nset of states with constant fidelity, and use this to prove tight lower and\nupper bounds on the fidelity for a given amount of entanglement.",
    "arxiv_id": "quant-ph/0203073",
    "authors": [
      "Frank Verstraete",
      "Henri Verschelde"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.66.022307",
    "journal_ref": "Phys. Rev. A 66: 022307 (2002)",
    "title": "On the fidelity of mixed states of two qubits",
    "url": "https://arxiv.org/abs/quant-ph/0203073"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b9b886f0-dabd-4886-aa9f-c2b8fb57963b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}