{
  "annotation_id": "256ba41a-c1c2-49c6-862b-978457c0f8a5",
  "date_created": "2026-03-02T18:02:30.153000Z",
  "date_modified": "2026-03-02T18:02:30.153000Z",
  "file_hash": "9e71987788c2623522145b86496f338ca928f2894ca3f4ecc3f755c834d9e573",
  "private": false,
  "record": {
    "abstract": "We present controllable generation of various kinds of highly nonclassical\nstates of light, including the single photon state and superposition states of\nmesoscopically distinct components. The high nonclassicality of the generated\nstates is measured by the negativity of the Wigner function, which is largest\never observed to our knowledge. Our scheme is based on photon subtraction from\na nearly pure squeezed vacuum, generated from an optical parametric oscillator\nwith a periodically-poled KTiOPO$_4$ crystal as a nonlinear medium. This is an\nimportant step to realize basic elements of universal quantum gates, and to\nserve as a highly nonclassical input probe for spectroscopy and the study of\nquantum memory.",
    "arxiv_id": "quant-ph/0609153",
    "authors": [
      "K. Wakui",
      "H. Takahashi",
      "A. Furusawa",
      "M. Sasaki"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1364/OE.15.003568",
    "journal_ref": "Optics Express, Vol. 15 Issue 6, pp. 3568-3574 (2007).",
    "title": "Controllable generation of highly nonclassical states from nearly pure   squeezed vacua",
    "url": "https://arxiv.org/abs/quant-ph/0609153"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "7cdd754f-22e0-45bd-ae08-291a0de601ac",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}