{
  "id": "quant-ph/0202100",
  "version": "v2",
  "published": "2002-02-19T12:16:33.000Z",
  "updated": "2002-08-06T13:23:50.000Z",
  "title": "A description of entanglement in terms of quantum phase",
  "authors": [
    "Luis L. Sanchez-Soto",
    "Julian Delgado",
    "Andrei B. Klimov",
    "Gunnar Bjork"
  ],
  "comment": "11 pages, previous title has changed, new section added, corrected typos, no figures",
  "journal": "Phys. Rev. A 66, 042112 (2002)",
  "doi": "10.1103/PhysRevA.66.042112",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We explore the role played by the phase in an accurate description of the entanglement of bipartite systems. We first present an appropriate polar decomposition that leads to a truly Hermitian operator for the phase of a single qubit. We also examine the positive operator-valued measures that can describe the qubit phase properties. When dealing with two qubits, the relative phase seems to be a natural variable to understand entanglement. In this spirit, we propose a measure of entanglement based on this variable.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2002-08-06T13:23:50.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum phase",
      "qubit phase properties",
      "appropriate polar decomposition",
      "bipartite systems",
      "understand entanglement"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. A"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}