{
  "annotation_id": "56693080-38da-47d2-a019-a6b2276fddd7",
  "date_created": "2026-03-02T18:01:45.403000Z",
  "date_modified": "2026-03-02T18:01:45.403000Z",
  "file_hash": "76eab0af474ec2914d85a1e6cdd758d05d426b5d9c127f6e6acf95279084756b",
  "private": false,
  "record": {
    "abstract": "We report the creation of a wide range of quantum states with controllable\ndegrees of entanglement and entropy using an optical two-qubit source based on\nspontaneous parametric downconversion. The states are characterised using\nmeasures of entanglement and entropy determined from tomographically determined\ndensity matrices. The Tangle-Entropy plane is introduced as a graphical\nrepresentation of these states, and the theoretic upper bound for the maximum\namount of entanglement possible for a given entropy is presented. Such a\ncombination of general quantum state creation and accurate characterisation is\nan essential prerequisite for quantum device development.",
    "arxiv_id": "quant-ph/0108088",
    "authors": [
      "A. G. White",
      "D. F. V. James",
      "W. J. Munro",
      "P. G. Kwiat"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.65.012301",
    "journal_ref": "Physical Review A 65, 012301 (2002)",
    "title": "Exploring Hilbert Space: accurate characterisation of quantum   information",
    "url": "https://arxiv.org/abs/quant-ph/0108088"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9b461f5a-030d-4f7f-8d13-bd0d341b80cc",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}