{
  "id": "quant-ph/0407061",
  "version": "v2",
  "published": "2004-07-08T18:49:29.000Z",
  "updated": "2006-08-09T14:14:34.000Z",
  "title": "Optimal superdense coding of entangled states",
  "authors": [
    "Anura Abeyesinghe",
    "Patrick Hayden",
    "Graeme Smith",
    "Andreas Winter"
  ],
  "comment": "Final Version. Several technical issues clarified",
  "journal": "IEEE Trans. Inform. Theory, vol. 52, no. 8, pp. 3635-3641, 2006",
  "doi": "10.1109/TIT.2006.878174",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We present a one-shot method for preparing pure entangled states between a sender and a receiver at a minimal cost of entanglement and quantum communication. In the case of preparing unentangled states, an earlier paper showed that a 2n-qubit quantum state could be communicated to a receiver by physically transmitting only n+o(n) qubits in addition to consuming n ebits of entanglement and some shared randomness. When the states to be prepared are entangled, we find that there is a reduction in the number of qubits that need to be transmitted, interpolating between no communication at all for maximally entangled states and the earlier two-for-one result of the unentangled case, all without the use of any shared randomness. We also present two applications of our result: a direct proof of the achievability of the optimal superdense coding protocol for entangled states produced by a memoryless source, and a demonstration that the quantum identification capacity of an ebit is two qubits.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2006-08-09T14:14:34.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "entangled states",
      "quantum identification capacity",
      "optimal superdense coding protocol",
      "earlier two-for-one result",
      "shared randomness"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2004quant.ph..7061A"
    }
  }
}