{
  "id": "1112.3280",
  "version": "v3",
  "published": "2011-12-14T17:16:26.000Z",
  "updated": "2012-05-22T14:27:17.000Z",
  "title": "Optimal correlations in many-body quantum systems",
  "authors": [
    "Luigi Amico",
    "Davide Rossini",
    "Alioscia Hamma",
    "Vladimir E. Korepin"
  ],
  "comment": "5 pages, 5 figures + supplementary material. To be published in PRL",
  "journal": "Phys. Rev. Lett. 108, 240503 (2012)",
  "doi": "10.1103/PhysRevLett.108.240503",
  "categories": [
    "quant-ph",
    "cond-mat.stat-mech"
  ],
  "abstract": "Information and correlations in a quantum system are closely related through the process of measurement. We explore such relation in a many-body quantum setting, effectively bridging between quantum metrology and condensed matter physics. To this aim we adopt the information-theory view of correlations, and study the amount of correlations after certain classes of Positive-Operator-Valued Measurements are locally performed. As many-body system we consider a one-dimensional array of interacting two-level systems (a spin chain) at zero temperature, where quantum effects are most pronounced. We demonstrate how the optimal strategy to extract the correlations depends on the quantum phase through a subtle interplay between local interactions and coherence.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2012-05-22T14:27:17.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.67.Mn",
      "03.65.Ta",
      "05.30.Rt",
      "75.10.Pq"
    ],
    "keywords": [
      "many-body quantum systems",
      "optimal correlations",
      "quantum metrology",
      "condensed matter physics",
      "information-theory view"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2012,
      "month": "Jun",
      "volume": 108,
      "number": 24,
      "pages": 240503
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012PhRvL.108x0503A"
    }
  }
}