{
  "id": "0809.1932",
  "version": "v5",
  "published": "2008-09-11T10:23:18.000Z",
  "updated": "2009-04-06T00:41:39.000Z",
  "title": "Entanglement Measures for Intermediate Separability of Quantum States",
  "authors": [
    "Tsubasa Ichikawa",
    "Toshihiko Sasaki",
    "Izumi Tsutsui"
  ],
  "comment": "8 pages, 8 figures",
  "journal": "Phys. Rev. A79 (2009) 052307",
  "doi": "10.1103/PhysRevA.79.052307",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We present a family of entanglement measures R_m which act as indicators for separability of n-qubit quantum states into m subsystems for arbitrary 2 \\leq m \\leq n. The measure R_m vanishes if the state is separable into m subsystems, and for m = n it gives the Meyer-Wallach measure while for m = 2 it reduces, in effect, to the one introduced recently by Love et al. The measures R_m are evaluated explicitly for the GHZ state and the W state (and its modifications, the W_k states) to show that these globally entangled states exhibit rather distinct behaviors under the measures, indicating the utility of the measures R_m for characterizing globally entangled states as well.",
  "revisions": [
    {
      "version": "v5",
      "updated": "2009-04-06T00:41:39.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.67.Mn",
      "03.65.Ta",
      "03.65.Ud"
    ],
    "keywords": [
      "entanglement measures",
      "intermediate separability",
      "globally entangled states",
      "n-qubit quantum states",
      "subsystems"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2009,
      "month": "May",
      "volume": 79,
      "number": 5,
      "pages": "052307"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvA..79e2307I"
    }
  }
}