{
  "annotation_id": "9fddb282-fb60-42c9-ae18-9e1300468204",
  "date_created": "2026-03-02T18:02:37.760000Z",
  "date_modified": "2026-03-02T18:02:37.760000Z",
  "file_hash": "67b7e74bbd4deb2005aed3d711413d0a30b5c4f3c6f8a133aa5ebc6ce32f2435",
  "private": false,
  "record": {
    "abstract": "A new method is described for determining the quantum state of correlated\nmultimode radiation by interfering the modes and measuring the statistics of\nthe superimposed fields in four-port balanced homodyne detection. The full\ninformation on the $N$-mode quantum state is obtained by controlling both the\nrelative amplitudes and the phases of the modes, which simplifies the\nreconstruction of density matrices to only $N+1$ Fourier transforms. In\nparticular, this method yields time-correlated multimode density matrices of\noptical pulses by superimposing the signal by a sequence of short\nlocal-oscillator pulses.",
    "arxiv_id": "quant-ph/9604020",
    "authors": [
      "T. Opatrny",
      "D. -G. Welsch",
      "W. Vogel"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1016/S0030-4018(96)00548-2",
    "title": "Multi-mode density matrices of light via amplitude and phase control",
    "url": "https://arxiv.org/abs/quant-ph/9604020"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2b714721-ba7b-4b0f-93a2-28276e28c302",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}