{
  "annotation_id": "9cd4f259-2d7d-4ef3-8874-db80d1c0edf8",
  "date_created": "2026-03-02T18:02:19.753000Z",
  "date_modified": "2026-03-02T18:02:19.753000Z",
  "file_hash": "07e92fae1d456cc1455a4d8574d1253d21fd072da6452b66528d81c3256fb2f4",
  "private": false,
  "record": {
    "abstract": "We present a class of observables which are suitable for determining the\nfidelity of a state to the multipartite Greenberger-Horne-Zeilinger (GHZ)\nstate. Given an expectation value of an observable belonging to the class, we\ngive a simple formula that gives a lower bound and an upper bound for the\nfidelity. Applying the formula to the GHZ-state preparation experiment by Pan\n{\\it et al}. {[Nature (London) {\\bf 403}, 515 (2000)]}, we show that the\nobserved state lies outside of the class of biseparable mixed three-qubit\nstates. We also show that for this class of operators, adopting the principle\nof minimum variance {[Phys. Rev. A {\\bf 60}, 4338 (1999)]} in the state\nestimation always results in the state with the minimum fidelity.",
    "arxiv_id": "quant-ph/0510237",
    "authors": [
      "Koji Nagata",
      "Masato Koashi",
      "Nobuyuki Imoto"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.65.042314",
    "journal_ref": "Phys. Rev. A 65, 042314 (2002)",
    "title": "Observables suitable for restricting the fidelity to multipartite   maximally entangled states",
    "url": "https://arxiv.org/abs/quant-ph/0510237"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "055d08ef-21cc-4d72-bf22-9014969b2581",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}