{
  "id": "cond-mat/0503676",
  "version": "v4",
  "published": "2005-03-29T12:15:15.000Z",
  "updated": "2005-07-08T06:23:40.000Z",
  "title": "Transfer of entanglement from electrons to photons by optical selection rules",
  "authors": [
    "M. Titov",
    "B. Trauzettel",
    "B. Michaelis",
    "C. W. J. Beenakker"
  ],
  "comment": "6 pages; contribution for the focus issue of New Journal of Physics on \"Solid State Quantum Information\"; revised in response to referee reports",
  "journal": "New Journal of Physics 7, 186 (2005)",
  "doi": "10.1088/1367-2630/7/1/186",
  "categories": [
    "cond-mat.mes-hall",
    "quant-ph"
  ],
  "abstract": "The entanglement transfer from electrons localized in a pair of quantum dots to circularly polarized photons is governed by optical selection rules, enforced by conservation of angular momentum. We point out that the transfer can not be achieved by means of unitary evolution unless the angular momentum of the two initial qubit states differs by 2 units. In particular, for spin-entangled electrons the difference in angular momentum is 1 unit -- so the transfer fails. Nevertheless, the transfer can be successfully completed if the unitary evolution is followed by a measurement of the angular momentum of each quantum dot and post-processing of the photons using the measured values as input.",
  "revisions": [
    {
      "version": "v4",
      "updated": "2005-07-08T06:23:40.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "optical selection rules",
      "angular momentum",
      "unitary evolution",
      "quantum dot",
      "initial qubit states differs"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}