{
  "id": "quant-ph/0210205",
  "version": "v1",
  "published": "2002-10-30T19:34:43.000Z",
  "updated": "2002-10-30T19:34:43.000Z",
  "title": "Estimating the post-measurement state",
  "authors": [
    "Jürgen Audretsch",
    "Lajos Diósi",
    "Thomas Konrad"
  ],
  "comment": "4 pages, 1 figure",
  "journal": "Phys. Rev. A68 (2003) 34302-(4)",
  "doi": "10.1103/PhysRevA.68.034302",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We study generalized measurements (POVM measurements) on a single d-level quantum system which is in a completely unknown pure state, and derive the best estimate of the post-measurement state. The mean post-measuremement estimation fidelity of a generalized measurement is obtained and related to the operation fidelity of the device. This illustrates how the information gain about the post-measurement state and the corresponding state disturbance are mutually dependent. The connection between the best estimates of the pre- and post-measurement state is established and interpreted. For pure generalized measurements the two states coincide.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2002-10-30T19:34:43.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "post-measurement state",
      "single d-level quantum system",
      "best estimate",
      "mean post-measuremement estimation fidelity",
      "unknown pure state"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. A"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}