{
  "id": "quant-ph/0307198",
  "version": "v1",
  "published": "2003-07-28T09:41:37.000Z",
  "updated": "2003-07-28T09:41:37.000Z",
  "title": "A de Finetti Representation Theorem for Quantum Process Tomography",
  "authors": [
    "Christopher A. Fuchs",
    "Ruediger Schack",
    "Petra F. Scudo"
  ],
  "comment": "10 pages",
  "journal": "Phys. Rev. A 69, 062305 (2004)",
  "doi": "10.1103/PhysRevA.69.062305",
  "categories": [
    "quant-ph"
  ],
  "abstract": "In quantum process tomography, it is possible to express the experimenter's prior information as a sequence of quantum operations, i.e., trace-preserving completely positive maps. In analogy to de Finetti's concept of exchangeability for probability distributions, we give a definition of exchangeability for sequences of quantum operations. We then state and prove a representation theorem for such exchangeable sequences. The theorem leads to a simple characterization of admissible priors for quantum process tomography and solves to a Bayesian's satisfaction the problem of an unknown quantum operation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2003-07-28T09:41:37.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum process tomography",
      "finetti representation theorem",
      "unknown quantum operation",
      "experimenters prior information",
      "finettis concept"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. A"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}