{
  "id": "1111.2847",
  "version": "v1",
  "published": "2011-11-11T20:37:54.000Z",
  "updated": "2011-11-11T20:37:54.000Z",
  "title": "Task-dependent control of open quantum systems",
  "authors": [
    "Jens Clausen",
    "Guy Bensky",
    "Gershon Kurizki"
  ],
  "comment": "9 pages, 7 figures, presented at DPG Spring Meeting, Dresden, 2011",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We develop a general optimization strategy for performing a chosen unitary or non-unitary task on an open quantum system. The goal is to design a controlled time-dependent system Hamiltonian by variationally minimizing or maximizing a chosen function of the system state, which quantifies the task success (score), such as fidelity, purity, or entanglement. If the time-dependence of the system Hamiltonian is fast enough to be comparable or shorter than the response-time of the bath, then the resulting non-Markovian dynamics is shown to optimize the chosen task score to second order in the coupling to the bath. This strategy can protect a desired unitary system evolution from bath-induced decoherence, but ca also take advantage of the system-bath coupling so as to realize a desired non-unitary effect on the system.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-11-11T20:37:54.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.65.Yz",
      "03.67.Pp",
      "37.10.-x",
      "02.60.-x"
    ],
    "keywords": [
      "open quantum system",
      "task-dependent control",
      "general optimization strategy",
      "controlled time-dependent system hamiltonian",
      "desired unitary system evolution"
    ],
    "publication": {
      "doi": "10.1103/PhysRevA.85.052105",
      "journal": "Physical Review A",
      "year": 2012,
      "month": "May",
      "volume": 85,
      "number": 5,
      "pages": "052105"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012PhRvA..85e2105C"
    }
  }
}