{
  "annotation_id": "5ee28b44-ae5b-4061-8cc0-13ea9307ad05",
  "date_created": "2026-03-02T18:02:06.438000Z",
  "date_modified": "2026-03-02T18:02:06.438000Z",
  "file_hash": "70a6421931c2bb2a11501ff496059fb7373b53709454aa1bc90af0e0b8a796f5",
  "private": false,
  "record": {
    "abstract": "We have experimentally realized the scheme initially proposed as quantum\ndense coding with continuous variables [Ban, J. Opt. B \\textbf{1}, L9 (1999),\nand Braunstein and Kimble, \\pra\\textbf{61}, 042302 (2000)]. In our experiment,\na pair of EPR (Einstein-Podolski-Rosen) beams is generated from two independent\nsqueezed vacua. After adding two-quadrature signal to one of the EPR beams, two\nsqueezed beams that contain the signal were recovered. Although our squeezing\nlevel is not sufficient to demonstrate the channel capacity gain over the\nHolevo limit of a single-mode channel without entanglement, our channel is\nsuperior to conventional channels such as coherent and squeezing channels. In\naddition, optical addition and subtraction processes demonstrated are\nelementary operations of universal quantum information processing on continuous\nvariables.",
    "arxiv_id": "quant-ph/0402040",
    "authors": [
      "Jun Mizuno",
      "Kentaro Wakui",
      "Akira Furusawa",
      "Masahide Sasaki"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.71.012304",
    "journal_ref": "PHYSICAL REVIEW A 71, 012304 (2005)",
    "title": "Experimental demonstration of entanglement assisted coding using a   two-mode squeezed vacuum state",
    "url": "https://arxiv.org/abs/quant-ph/0402040"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "76159876-a27e-469d-b471-3e45dc1e3d2b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}