{
  "annotation_id": "bf966ae7-e6c1-436a-944a-584c3bcb466b",
  "date_created": "2026-03-02T18:02:44.976000Z",
  "date_modified": "2026-03-02T18:02:44.976000Z",
  "file_hash": "10f5d2740cf38f082412ba86aefa39d40a4d50457ff380e4b228c0610a09c2c0",
  "private": false,
  "record": {
    "abstract": "We demonstrate the simultaneous quantum state reconstruction of the spectral\nmodes of the light field emitted by a continuous wave degenerate optical\nparametric amplifier. The scheme is based on broadband measurement of the\nquantum fluctuations of the electric field quadratures and subsequent Fourier\ndecomposition into spectral intervals. Applying the standard reconstruction\nalgorithms to each bandwidth-limited quantum trajectory, a \"spectrum\" of\ndensity matrices and Wigner functions is obtained. The recorded states show a\nsmooth transition from the squeezed vacuum to a vacuum state. In the time\ndomain we evaluated the first order correlation function of the squeezed output\nfield, showing good agreement with the theory.",
    "arxiv_id": "quant-ph/9901044",
    "authors": [
      "Gerd Breitenbach",
      "Fabrizio Illuminati",
      "Stephan Schiller",
      "Jurgen Mlynek"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1209/epl/i1998-00456-2",
    "journal_ref": "Europhys.Lett. 44 (1998) 192",
    "title": "Broadband detection of squeezed vacuum: A spectrum of quantum states",
    "url": "https://arxiv.org/abs/quant-ph/9901044"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f90d7020-2a09-49ee-8fde-2021393f47bd",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}