{
  "id": "1003.4979",
  "version": "v2",
  "published": "2010-03-25T19:30:26.000Z",
  "updated": "2010-07-15T19:53:58.000Z",
  "title": "Quantum versus classical correlations in Gaussian states",
  "authors": [
    "Gerardo Adesso",
    "Animesh Datta"
  ],
  "comment": "4+2 pages, 1+1 figures. Close to published version including appendix",
  "journal": "Phys. Rev. Lett. 105, 030501 (2010)",
  "doi": "10.1103/PhysRevLett.105.030501",
  "categories": [
    "quant-ph",
    "cond-mat.stat-mech",
    "physics.optics"
  ],
  "abstract": "Quantum discord, a measure of genuinely quantum correlations, is generalized to continuous variable systems. For all two-mode Gaussian states, we calculate analytically the quantum discord and a related measure of classical correlations, solving an optimization over all Gaussian measurements. Almost all two-mode Gaussian states are shown to have quantum correlations, while for separable states, the discord is smaller than unity. For a given amount of entanglement, it admits tight upper and lower bounds. Via a duality between entanglement and classical correlations, we derive a closed formula for the Gaussian entanglement of formation of all mixed three-mode Gaussian states whose normal mode decomposition includes two vacua.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2010-07-15T19:53:58.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.67.-a",
      "03.65.Ta",
      "03.65.Ud"
    ],
    "keywords": [
      "classical correlations",
      "two-mode gaussian states",
      "quantum discord",
      "admits tight upper",
      "mixed three-mode gaussian states"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2010,
      "month": "Jul",
      "volume": 105,
      "number": 3,
      "pages": "030501"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 2,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvL.105c0501A"
    }
  }
}