{
  "id": "1011.3197",
  "version": "v1",
  "published": "2010-11-14T09:00:43.000Z",
  "updated": "2010-11-14T09:00:43.000Z",
  "title": "Quantum-limited metrology in the presence of collisional dephasing",
  "authors": [
    "Y. C. Liu",
    "G. R. Jin",
    "L. You"
  ],
  "comment": "3.2 pages, 3 figures",
  "journal": "Phys. Rev. A 82,045601(2010)",
  "doi": "10.1103/PhysRevA.82.045601",
  "categories": [
    "quant-ph",
    "cond-mat.quant-gas"
  ],
  "abstract": "Including collisional decoherence explicitly, phase sensitivity for estimating effective scattering strength $\\chi$ of a two-component Bose-Einstein condensate is derived analytically. With a measurement of spin operator $\\hat{J}_{x}$, we find that the optimal sensitivity depends on initial coherent spin state. It degrades by a factor of $(2\\gamma)^{1/3}$ below super-Heisenberg limit $\\propto 1/N^{3/2}$ for particle number $N$ and the dephasing rate $1<\\!<\\gamma<N^{3/4}$. With a $\\hat{J}_y$ measurement, our analytical results confirm that the phase $\\phi=\\chi t\\sim 0$ can be detected at the limit even in the presence of the dephasing.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-11-14T09:00:43.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.75.Dg",
      "03.75.Mn",
      "03.75.Gg"
    ],
    "keywords": [
      "quantum-limited metrology",
      "collisional dephasing",
      "initial coherent spin state",
      "optimal sensitivity depends",
      "two-component bose-einstein condensate"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2010,
      "month": "Oct",
      "volume": 82,
      "number": 4,
      "pages": "045601"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 2,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvA..82d5601L"
    }
  }
}