{
  "id": "0704.1375",
  "version": "v1",
  "published": "2007-04-11T09:18:51.000Z",
  "updated": "2007-04-11T09:18:51.000Z",
  "title": "Decrease of entanglement by local operations in the Dür-Cirac method",
  "authors": [
    "Yukihiro Ota",
    "Motoyuki Yoshida",
    "Ichiro Ohba"
  ],
  "comment": "5 pages",
  "categories": [
    "quant-ph"
  ],
  "abstract": "One cannot always obtain information about entanglement by the D\\\"ur-Cirac (DC) method. The impracticality is attributed to the decrease of entanglement by local operations in the DC method. We show that, even in 2--qubit systems, there exist states whose entangled property the DC method never evaluates. The class of such states in 2--qubit systems is completely characterized by the value of the fully entangled fraction. Actually, a state whose fully entangled fraction is less than or equal to 1/2 is always transformed into a separable state by local operations in the DC method, even if it has negative partial transposition.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2007-04-11T09:18:51.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "local operations",
      "dür-cirac method",
      "dc method",
      "entanglement",
      "fully entangled fraction"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2007arXiv0704.1375O"
    }
  }
}