{
  "annotation_id": "215f76a1-b08d-41c1-b0dc-bc3d02b0612c",
  "date_created": "2026-03-02T18:02:20.143000Z",
  "date_modified": "2026-03-02T18:02:20.143000Z",
  "file_hash": "4215eabcf7862bcda0660f0187b3667c36fa15e0d984dc23690aa415a90f0dd3",
  "private": false,
  "record": {
    "abstract": "Non-local properties of symmetric two-qubit states are quantified in terms of\na complete set of entanglement invariants. We prove that negative values of\nsome of the invariants are signatures of quantum entanglement. This leads us to\nidentify sufficient conditions for non-separability in terms of entanglement\ninvariants. Non-local properties of two-qubit states extracted from (i) Dicke\nstate (ii) state generated by one-axis twisting Hamiltonian, and (iii)\none-dimensional Ising chain with nearest neighbour interaction are analyzed in\nterms of the invariants characterizing them.",
    "arxiv_id": "quant-ph/0509015",
    "authors": [
      "A. R. Usha Devi",
      "M. S. Uma",
      "R. Prabhu",
      "Sudha"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/1464-4266/7/12/042",
    "journal_ref": "J. Opt. B: Quantum Semiclass. Opt. 7, S740 (2005)",
    "title": "Non-local properties of a symmetric two-qubit system",
    "url": "https://arxiv.org/abs/quant-ph/0509015"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "81403a44-058f-4719-9d1e-607992466ab4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}