{
  "annotation_id": "f482fcb1-7072-48f1-b938-ca41f2f01a31",
  "date_created": "2026-03-02T18:02:27.703000Z",
  "date_modified": "2026-03-02T18:02:27.703000Z",
  "file_hash": "6d39028f5732b1af9c23da482beb9160b35df05449787b530dd8cdc56494292f",
  "private": false,
  "record": {
    "abstract": "We analyze in detail the proposal for a two-qubit gate for travelling\nsingle-photon qubits recently presented by C. Ottaviani \\emph{et al}. [Phys.\nRev. A \\textbf{73}, 010301(R) (2006)]. The scheme is based on an ensemble of\nfive-level atoms coupled to two quantum and two classical light fields. The two\nquantum fields undergo cross-phase modulation induced by electromagnetically\ninduced transparency. The performance of this two-qubit quantum phase gate for\ntravelling single-photon qubits is thoroughly examined in the steady-state and\ntransient regimes, by means of a full quantum treatment of the system dynamics.\nIn the steady-state regime, we find a general trade-off between the size of the\nconditional phase shift and the fidelity of the gate operation. However, this\ntrade-off can be bypassed in the transient regime, where a satisfactory gate\noperation is found to be possible, significantly reducing the gate operation\ntime.",
    "arxiv_id": "quant-ph/0605100",
    "authors": [
      "S. Rebic",
      "C. Ottaviani",
      "G. Di Giuseppe",
      "D. Vitali",
      "P. Tombesi"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.74.032301",
    "journal_ref": "Phys Rev A 74, 032301 (2006)",
    "title": "Assessment of a quantum phase gate operation based on nonlinear optics",
    "url": "https://arxiv.org/abs/quant-ph/0605100"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "cb066ac1-1836-4617-b7af-ff1589218edc",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}