{
  "id": "1310.2687",
  "version": "v3",
  "published": "2013-10-10T02:55:27.000Z",
  "updated": "2014-03-31T17:48:59.000Z",
  "title": "Quantum Fisher information for states in exponential form",
  "authors": [
    "Zhang Jiang"
  ],
  "comment": "10 pages",
  "journal": "Phys. Rev. A 89, 032128 (2014)",
  "doi": "10.1103/PhysRevA.89.032128",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We derive explicit expressions for the quantum Fisher information and the symmetric logarithmic derivative (SLD) of a quantum state in the exponential form; the SLD is expressed in terms of the generator. Applications include quantum-metrology problems with Gaussian states and general thermal states. Specifically, we give the SLD for a Gaussian state in two forms, in terms of its generator and its moments; the Fisher information is also calculated for both forms. Special cases are discussed, including pure, degenerate, and very noisy Gaussian states.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2014-03-31T17:48:59.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.65.Ta",
      "03.67.-a",
      "06.20.-f"
    ],
    "keywords": [
      "quantum fisher information",
      "exponential form",
      "noisy gaussian states",
      "general thermal states",
      "symmetric logarithmic"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2014,
      "month": "Mar",
      "volume": 89,
      "number": 3,
      "pages": "032128"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1258027,
      "adsabs": "2014PhRvA..89c2128J"
    }
  }
}