{
  "id": "0705.4225",
  "version": "v1",
  "published": "2007-05-29T14:16:20.000Z",
  "updated": "2007-05-29T14:16:20.000Z",
  "title": "How to detect a possible correlation from the information of a sub-system in quantum mechanical systems",
  "authors": [
    "Gen Kimura",
    "Hiromichi Ohno",
    "Hiroyuki Hayashi"
  ],
  "comment": "7 pages, 1 figure",
  "journal": "Phys. Rev. A 76, 042123 (2007)",
  "doi": "10.1103/PhysRevA.76.042123",
  "categories": [
    "quant-ph"
  ],
  "abstract": "A possibility to detect correlations between two quantum mechanical systems only from the information of a subsystem is investigated. For generic cases, we prove that there exist correlations between two quantum systems if the time-derivative of the reduced purity is not zero. Therefore, an experimentalist can conclude non-zero correlations between his/her system and some environment if he/she finds the time-derivative of the reduced purity is not zero. A quantitative estimation of a time-derivative of the reduced purity with respect to correlations is also given. This clarifies the role of correlations in the mechanism of decoherence in open quantum systems.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2007-05-29T14:16:20.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.65.Yz",
      "03.65.Ta"
    ],
    "keywords": [
      "quantum mechanical systems",
      "reduced purity",
      "information",
      "sub-system",
      "conclude non-zero correlations"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2007,
      "month": "Oct",
      "volume": 76,
      "number": 4,
      "pages": "042123"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2007PhRvA..76d2123K"
    }
  }
}