{
  "id": "1010.3521",
  "version": "v3",
  "published": "2010-10-18T08:45:07.000Z",
  "updated": "2011-04-26T11:57:09.000Z",
  "title": "Comparison of different measures for quantum discord under non-Markovian noise",
  "authors": [
    "Zhenyu Xu",
    "Wanli Yang",
    "Xing Xiao",
    "Mang Feng"
  ],
  "comment": "10 pages, 3 figures submitted for publication",
  "journal": "J. Phys. A: Math. Theor. 44 (2011) 395304",
  "doi": "10.1088/1751-8113/44/39/395304",
  "categories": [
    "quant-ph"
  ],
  "abstract": "Two geometric measures for quantum discord were recently proposed by Modi et al. [Phys. Rev. Lett. 104, 080501 (2010)] and Dakic et al. [Phys. Rev. Lett. 105, 190502 (2010)]. We study the similarities and differences for total quantum correlations of Bell-diagonal states using these two geometry-based quantum discord and the original quantum discord. We show that, under non-Markovian dephasing channels, quantum discord and one of the geometric measures stay constant for a finite amount of time, but not the other geometric measure. However, all the three measures share a common sudden change point. Our study on critical point of sudden transition might be useful for keeping long time total quantum correlations under decoherence.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2011-04-26T11:57:09.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum discord",
      "non-markovian noise",
      "long time total quantum correlations",
      "common sudden change point",
      "comparison"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Journal of Physics A Mathematical General",
      "year": 2011,
      "month": "Sep",
      "volume": 44,
      "number": 39,
      "pages": 395304
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2011JPhA...44M5304X"
    }
  }
}