{
  "id": "cond-mat/0406674",
  "version": "v2",
  "published": "2004-06-28T11:08:24.000Z",
  "updated": "2005-01-13T14:48:21.000Z",
  "title": "Direct equivalence between quantum phase transition phenomena in radiation-matter and magnetic systems: scaling of entanglement",
  "authors": [
    "José Reslen",
    "Luis Quiroga",
    "Neil F. Johnson"
  ],
  "comment": "4 pages, 3 figures. Minor changes. Published version",
  "journal": "Europhysics Letters 69, 8 (2005)",
  "doi": "10.1209/epl/i2004-10313-4",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.stat-mech",
    "quant-ph"
  ],
  "abstract": "We show that the quantum phase transition arising in a standard radiation-matter model (Dicke model) belongs to the same universality class as the infinitely-coordinated, transverse field XY model. The effective qubit-qubit exchange interaction is shown to be proportional to the square of the qubit-radiation coupling. A universal finite-size scaling is derived for the corresponding two-qubit entanglement (concurrence) and a size-consistent effective Hamiltonian is proposed for the qubit subsystem.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2005-01-13T14:48:21.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum phase transition phenomena",
      "magnetic systems",
      "direct equivalence",
      "entanglement",
      "transverse field xy model"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}