{
  "id": "0912.4654",
  "version": "v2",
  "published": "2009-12-23T14:34:46.000Z",
  "updated": "2010-12-21T16:11:00.000Z",
  "title": "Decoherence and Entanglement Dynamics in Fluctuating Fields",
  "authors": [
    "Julius Helm",
    "Walter T. Strunz"
  ],
  "comment": "10 pages, 5 figures, added minor changes in order to match published version",
  "journal": "Physical Review A 81, 042314 (2010)",
  "doi": "10.1103/PhysRevA.81.042314",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We study pure phase damping of two qubits due to fluctuating fields. As frequently employed, decoherence is thus described in terms of random unitary (RU) dynamics, i.e., a convex mixture of unitary transformations. Based on a separation of the dynamics into an average Hamiltonian and a noise channel, we are able to analytically determine the evolution of both entanglement and purity. This enables us to characterize the dynamics in a concurrence-purity (CP) diagram: we find that RU phase damping dynamics sets constraints on accessible regions in the CP plane. We show that initial state and dynamics contribute to final entanglement independently.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2010-12-21T16:11:00.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.67.Bg",
      "03.65.Yz",
      "03.65.Ud"
    ],
    "keywords": [
      "fluctuating fields",
      "entanglement dynamics",
      "decoherence",
      "ru phase damping dynamics sets",
      "phase damping dynamics sets constraints"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2010,
      "month": "Apr",
      "volume": 81,
      "number": 4,
      "pages": "042314"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvA..81d2314H"
    }
  }
}