{
  "id": "1204.3912",
  "version": "v1",
  "published": "2012-04-17T20:37:41.000Z",
  "updated": "2012-04-17T20:37:41.000Z",
  "title": "X-matrices provide a lower bound of concurrence",
  "authors": [
    "S. M. Hashemi rafsanjani",
    "S. Agarwal"
  ],
  "categories": [
    "quant-ph"
  ],
  "abstract": "By focusing on the X-matrix part of a density matrix of two qubits we provide an algebraic lower bound for the concurrence. The lower bound is generalized for cases beyond two qubits and can serve as a sufficient condition for non-separability for bipartite density matrices of arbitrary dimension. Experimentally, our lower bound can be used to confirm non-separability without performing a complete state tomography.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-04-17T20:37:41.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "concurrence",
      "x-matrices",
      "complete state tomography",
      "algebraic lower bound",
      "bipartite density matrices"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012arXiv1204.3912H"
    }
  }
}