{
  "annotation_id": "a0a07cf7-42a9-4647-826d-479c49803008",
  "date_created": "2026-03-02T18:02:48.106000Z",
  "date_modified": "2026-03-02T18:02:48.106000Z",
  "file_hash": "8fa460d4a1a27a6b181f77c7a1961d0c19aaf9e84d5dca3b9a49e450ab23046e",
  "private": false,
  "record": {
    "abstract": "Using a spontaneous-downconversion photon source, we produce true\nnon-maximally entangled states, i.e., without the need for post-selection. The\ndegree and phase of entanglement are readily tunable, and are characterized\nboth by a standard analysis using coincidence minima, and by quantum state\ntomography of the two-photon state. Using the latter, we experimentally\nreconstruct the reduced density matrix for the polarization. Finally, we use\nthese states to measure the Hardy fraction, obtaining a result that is $122\n\\sigma$ from any local-realistic result.",
    "arxiv_id": "quant-ph/9908081",
    "authors": [
      "Andrew G. White",
      "Daniel F. V. James",
      "Philippe H. Eberhard",
      "Paul G. Kwiat"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.83.3103",
    "journal_ref": "Physical Review Letters 83, no. 16, pp. 3103-3107 (1999)",
    "title": "Non-maximally entangled states: production, characterization and   utilization",
    "url": "https://arxiv.org/abs/quant-ph/9908081"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9bd0d91a-75f0-4f04-82d3-0bb39932de30",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}