{
  "annotation_id": "bf99c923-1f2c-4000-bde8-5ec4026a36a4",
  "date_created": "2026-03-02T18:01:49.221000Z",
  "date_modified": "2026-03-02T18:01:49.221000Z",
  "file_hash": "f40185e070c77b3d612c591795eb14db15d67b7afc88ce8fc709432c3042d337",
  "private": false,
  "record": {
    "abstract": "Motivated by the Kronecker product approximation technique, we have developed\na very simple method to assess the inseparability of bipartite quantum systems,\nwhich is based on a realigned matrix constructed from the density matrix. For\nany separable state, the sum of the singular values of the matrix should be\nless than or equal to 1. This condition provides a very simple, computable\nnecessary criterion for separability, and shows powerful ability to identify\nmost bound entangled states discussed in the literature. As a byproduct of the\ncriterion, we give an estimate for the degree of entanglement of the quantum\nstate.",
    "arxiv_id": "quant-ph/0205017",
    "authors": [
      "Kai Chen",
      "Ling-An Wu"
    ],
    "categories": [
      "quant-ph"
    ],
    "journal_ref": "Quantum Information and Computation, Vol.3, No.3 (2003) 193-202",
    "title": "A matrix realignment method for recognizing entanglement",
    "url": "https://arxiv.org/abs/quant-ph/0205017"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "be2955cd-f3c9-49f7-8379-2446a97aa00a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}