{
  "id": "1504.05278",
  "version": "v1",
  "published": "2015-04-21T02:17:16.000Z",
  "updated": "2015-04-21T02:17:16.000Z",
  "title": "Electromagnetic shielding in quantum metrology",
  "authors": [
    "Yao Jin",
    "Hongwei Yu"
  ],
  "comment": "16 pages, 3 figures",
  "journal": "Physical Review A 91, 022120 (2015)",
  "doi": "10.1103/PhysRevA.91.022120",
  "categories": [
    "quant-ph"
  ],
  "abstract": "The dynamics of the quantum Fisher information of the parameters of the initial atomic state and atomic transition frequency is studied, in the framework of open quantum systems, for a static polarizable two-level atom coupled in the multipolar scheme to a bath of fluctuating vacuum electromagnetic fields without and with the presence of a reflecting boundary. Our results show that in the case without a boundary, the electromagnetic vacuum fluctuations always cause the quantum Fisher information of the initial parameters and thus the precision limit of parameter estimation to decrease. Remarkably, however, with the presence of a boundary, the quantum Fisher information becomes position and atomic polarization dependent, and as a result, it may be enhanced as compared to that in the case without a boundary and may even be shielded from the influence of the vacuum fluctuations in certain circumstances as if it were a closed system.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-04-21T02:17:16.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum fisher information",
      "quantum metrology",
      "electromagnetic shielding",
      "polarizable two-level atom",
      "atomic polarization dependent"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. A"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}