{
  "id": "1203.2251",
  "version": "v2",
  "published": "2012-03-10T14:06:00.000Z",
  "updated": "2012-05-05T13:11:48.000Z",
  "title": "Information gain versus coupling strength in quantum measurements",
  "authors": [
    "Xuanmin Zhu",
    "Yuxiang Zhang",
    "Quanhui Liu",
    "Shengjun Wu"
  ],
  "comment": "7 pages, 1 figures",
  "journal": "Physical Review A 85, 042330 (2012)",
  "doi": "10.1103/PhysRevA.85.042330",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We investigate the relationship between the information gain and the interaction strength between the quantum system and the measuring device. A strategy is proposed to calculate the information gain of the measuring device as the coupling strength is a variable. For qubit systems, we prove that the information gain increases monotonically with the coupling strength. It is obtained that the information gain of the projective measurement along the x-direction reduces with the increasing of the measurement strength along the z-direction, and a complementarity of information gain in the measurements along those two directions is presented.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2012-05-05T13:11:48.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.67.-a",
      "03.65.Ta"
    ],
    "keywords": [
      "coupling strength",
      "quantum measurements",
      "measuring device",
      "qubit systems",
      "quantum system"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2012,
      "month": "Apr",
      "volume": 85,
      "number": 4,
      "pages": "042330"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012PhRvA..85d2330Z"
    }
  }
}