{
  "annotation_id": "dd3b3ded-bd82-4f06-8b6b-924fe756c341",
  "date_created": "2026-03-02T18:01:58.862000Z",
  "date_modified": "2026-03-02T18:01:58.862000Z",
  "file_hash": "20d758b735631023a4f5e955956519668c2d8681be5c97ea4d3b3ede815af718",
  "private": false,
  "record": {
    "abstract": "We propose a new spin squeezing criterion for arbitrary multi-qubit states\nthat is invariant under local unitary operations. We find that, for arbitrary\npure two-qubit states, spin squeezing is equivalent to entanglement, and\nmulti-qubit states are entangled if this new spin squeezing parameter is less\nthan 1.",
    "arxiv_id": "quant-ph/0304051",
    "authors": [
      "A. R. Usha Devi",
      "Xiaoguang Wang",
      "Barry C Sanders"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1023/B:QINP.0000004125.12489.f4",
    "journal_ref": "Quantum Information Processing 2 (3), 207-220 (2003).",
    "title": "Spin squeezing criterion with local unitary invariance",
    "url": "https://arxiv.org/abs/quant-ph/0304051"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4342055d-5ae6-4363-9e56-82739726efbe",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}