{
  "id": "quant-ph/0406013",
  "version": "v1",
  "published": "2004-06-02T02:10:12.000Z",
  "updated": "2004-06-02T02:10:12.000Z",
  "title": "Entanglement of electron spins in superconductors",
  "authors": [
    "Sangchul Oh",
    "Jaewan Kim"
  ],
  "comment": "4 pages, 2 eps figures",
  "journal": "Physical Review B 71, 144523 (2005)",
  "doi": "10.1103/PhysRevB.71.144523",
  "categories": [
    "quant-ph",
    "cond-mat.mes-hall"
  ],
  "abstract": "We investigate entanglement of two electron spins forming Cooper pairs in an s-wave superconductor. The two-electron space-spin density matrix is obtained from the BCS ground state using a two-particle Green's function. It is demonstrated that a two spin state is not given by a spin singlet state but by a Werner state. It is found that the entanglement length, within which two spins are entangled, is not the order of the coherence length but the order of the Fermi wave length.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2004-06-02T02:10:12.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "entanglement",
      "superconductor",
      "electron spins forming cooper pairs",
      "two-electron space-spin density matrix",
      "fermi wave length"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. B"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}