{
  "annotation_id": "e7bfb700-fe69-4740-83a4-7946ddaacc9b",
  "date_created": "2026-03-02T18:01:48.887000Z",
  "date_modified": "2026-03-02T18:01:48.887000Z",
  "file_hash": "65c46e1a6f72da44940a8f2052061c098165fd2376d60be7e363795a39bb5ed2",
  "private": false,
  "record": {
    "abstract": "We explore the role played by the phase in an accurate description of the\nentanglement of bipartite systems. We first present an appropriate polar\ndecomposition that leads to a truly Hermitian operator for the phase of a\nsingle qubit. We also examine the positive operator-valued measures that can\ndescribe the qubit phase properties. When dealing with two qubits, the relative\nphase seems to be a natural variable to understand entanglement. In this\nspirit, we propose a measure of entanglement based on this variable.",
    "arxiv_id": "quant-ph/0202100",
    "authors": [
      "Luis L. Sanchez-Soto",
      "Julian Delgado",
      "Andrei B. Klimov",
      "Gunnar Bjork"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.66.042112",
    "journal_ref": "Phys. Rev. A 66, 042112 (2002)",
    "title": "A description of entanglement in terms of quantum phase",
    "url": "https://arxiv.org/abs/quant-ph/0202100"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c456a10a-f15b-4d86-96ee-61dc6182b606",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}