{
  "id": "1112.1279",
  "version": "v1",
  "published": "2011-12-06T14:04:08.000Z",
  "updated": "2011-12-06T14:04:08.000Z",
  "title": "Global entanglement in XXZ chains",
  "authors": [
    "N. Canosa",
    "R. Rossignoli"
  ],
  "comment": "8 pages, 5 figures",
  "journal": "Physical Review A 73, 022347 (2006)",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We examine the thermal entanglement of XXZ-type Heisenberg chains in the presence of a uniform magnetic field along the z axes, through the evaluation of the negativity associated with bipartitions of the whole system and subsystems. Limit temperatures for non-zero global negativities are shown to depend on the asymmetry $\\Delta$ but not on the uniform field, and can be much higher than those limiting pairwise entanglement. It is also shown that global bipartite entanglement may exist for T>0 even for $\\Delta\\geq 1$, i.e., when the system is fully aligned (and hence separable) at T=0, and that the bipartition leading to the highest limit temperature depends on $\\Delta$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-12-06T14:04:08.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.67.Mn",
      "03.65.Ud",
      "75.10.Jm"
    ],
    "keywords": [
      "xxz chains",
      "global entanglement",
      "highest limit temperature depends",
      "xxz-type heisenberg chains",
      "uniform magnetic field"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "doi": "10.1103/PhysRevA.73.022347",
      "year": 2006,
      "month": "Feb",
      "volume": 73,
      "number": 2,
      "pages": "022347"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2006PhRvA..73b2347C"
    }
  }
}