{
  "id": "1010.1920",
  "version": "v3",
  "published": "2010-10-10T13:21:48.000Z",
  "updated": "2012-01-30T06:27:25.000Z",
  "title": "Tight lower bound to the geometric measure of quantum discord",
  "authors": [
    "Ali Saif M. Hassan",
    "Behzad Lari",
    "Pramod S. Joag"
  ],
  "comment": "10 pages,2 figures. In the previous versions, a constraint was ignored while optimizing the second term in Eq.(5), in which case, only a lower bound on the geometric discord can be obtained. The title is also consequently changed. Accepted in Phys.Rev.A",
  "journal": "Physical Review A 85, 024302 (2012)",
  "categories": [
    "quant-ph"
  ],
  "abstract": "Dakic, Vedral and Brukner [Physical Review Letters \\tf{105},190502 (2010)] gave a geometric measure of quantum discord in a bipartite quantum state as the distance of the state from the closest classical quantum (or zero discord) state and derived an explicit formula for a two qubit state. Further, S.Luo and S.Fu [Physical Review A \\tf{82}, 034302 (2010)] obtained a generic form of this geometric measure for a general bipartite state and established a lower bound. In this brief report we obtain a rigorous lower bound to the geometric measure of quantum discord in a general bipartite state which dominates that obtained by S.Luo and S.Fu.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2012-01-30T06:27:25.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.67.-a",
      "03.65.Ta"
    ],
    "keywords": [
      "geometric measure",
      "quantum discord",
      "tight lower bound",
      "general bipartite state",
      "physical review"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "doi": "10.1103/PhysRevA.85.024302",
      "year": 2012,
      "month": "Feb",
      "volume": 85,
      "number": 2,
      "pages": "024302"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012PhRvA..85b4302H"
    }
  }
}