{
  "id": "quant-ph/0007086",
  "version": "v1",
  "published": "2000-07-24T14:14:04.000Z",
  "updated": "2000-07-24T14:14:04.000Z",
  "title": "Entangled webs: Tight bound for symmetric sharing of entanglement",
  "authors": [
    "Masato Koashi",
    "Vladimir Buzek",
    "Nobuyuki Imoto"
  ],
  "comment": "4 pages, 1 figure",
  "doi": "10.1103/PhysRevA.62.050302",
  "categories": [
    "quant-ph"
  ],
  "abstract": "Quantum entanglement cannot be unlimitedly shared among arbitrary number of qubits. Larger the number of entangled pairs in an N-qubit system, smaller the degree of bi-partite entanglement is. We analyze a system of N qubits in which an arbitrary pair of particles is entangled. We show that the maximum degree of entanglement (measured in the concurrence) between any pair of qubits is 2/N. This tight bound can be achieved when the qubits are prepared in a pure symmetric (with respect to permutations) state with just one qubit in the basis state |0> and the others in the basis state |1>.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2000-07-24T14:14:04.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.67.-a",
      "03.65.Bz",
      "89.70.+c"
    ],
    "keywords": [
      "tight bound",
      "entangled webs",
      "symmetric sharing",
      "basis state",
      "arbitrary pair"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2000,
      "month": "Nov",
      "volume": 62,
      "number": 5,
      "pages": "050302"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2000PhRvA..62e0302K"
    }
  }
}