{
  "id": "quant-ph/0702211",
  "version": "v2",
  "published": "2007-02-23T19:28:02.000Z",
  "updated": "2007-05-08T19:39:46.000Z",
  "title": "Parameter estimation for mixed states from a single copy",
  "authors": [
    "Thomas Konrad",
    "Otfried Gühne",
    "Jürgen Audretsch",
    "Hans J. Briegel"
  ],
  "comment": "9 pages, 3 figures, v2: small changes, to appear in PRA",
  "journal": "Phys. Rev. A 75, 062101 (2007)",
  "doi": "10.1103/PhysRevA.75.062101",
  "categories": [
    "quant-ph"
  ],
  "abstract": "Given a single copy of a mixed state of the form \\rho=\\lambda\\rho_1+(1-\\lambda)\\rho_2, what is the optimal measurement to estimate the parameter \\lambda, if \\rho_1 and \\rho_2 are known? We present a general strategy to obtain the optimal measurements employing a Bayesian estimator. The measurements are chosen to minimize the deviation between the estimated- and the true value of \\lambda. We explicitly determine the optimal measurements for a general two-dimensional system and for important higher dimensional cases.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2007-05-08T19:39:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "single copy",
      "mixed state",
      "parameter estimation",
      "optimal measurement",
      "important higher dimensional cases"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. A"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}