{
  "id": "1608.01443",
  "version": "v1",
  "published": "2016-08-04T07:11:04.000Z",
  "updated": "2016-08-04T07:11:04.000Z",
  "title": "Fragile states are better for quantum metrology",
  "authors": [
    "Kavan Modi",
    "Lucas C. Céleri",
    "Jayne Thompson",
    "Mile Gu"
  ],
  "categories": [
    "quant-ph"
  ],
  "abstract": "In quantum metrology, quantum probe states are capable of estimating unknown physical parameters to precisions beyond classical limits. What qualities do such states possess? Here we relate the performance of a probe state at estimating a parameter $\\phi$ -- as quantified by the quantum Fisher information -- to the amount of purity it loses when $\\phi$ undergoes statistical fluctuation. This indicates that the better a state is for estimating $\\phi$, the more it decoheres when $\\phi$ is subject to noise.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-08-04T07:11:04.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum metrology",
      "fragile states",
      "quantum probe states",
      "quantum fisher information",
      "states possess"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}