{
  "annotation_id": "5961966e-3d26-41cd-a1e7-b20a202fd7c8",
  "date_created": "2026-03-02T18:02:20.549000Z",
  "date_modified": "2026-03-02T18:02:20.549000Z",
  "file_hash": "234e9e5de3134480c62f53a2de09416d91f266f6f5adbe35399c521570d83eef",
  "private": false,
  "record": {
    "abstract": "Lorentz transformations of spin density matrices for a particle with positive\nmass and spin 1/2 are described by maps of the kind used in open quantum\ndynamics. They show how the Lorentz transformations of the spin depend on the\nmomentum. Since the spin and momentum generally are entangled, the maps\ngenerally are not completely positive and act in limited domains. States with\ntwo momentum values are considered, so the maps are for the spin qubit\nentangled with the qubit made from the two momentum values, and results from\nthe open quantum dynamics of two coupled qubits can be applied. Inverse maps\nare used to show that every Lorentz transformation completely removes the spin\npolarization, and so completely removes the information, from a number of spin\ndensity matrices. The size of the spin polarization that is removed is\ncalculated for particular cases.",
    "arxiv_id": "quant-ph/0511067",
    "authors": [
      "Thomas F. Jordan",
      "Anil Shaji",
      "E. C. G. Sudarshan"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.73.032104",
    "journal_ref": "Phys.Rev.A73:032104,2006",
    "title": "Maps for Lorentz transformations of spin",
    "url": "https://arxiv.org/abs/quant-ph/0511067"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "a29a86d0-8df1-4546-9c0c-765d5aee63f7",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}