{
  "annotation_id": "868f1f70-0a81-4380-b50f-1a6f0ceab090",
  "date_created": "2026-03-02T18:01:56.502000Z",
  "date_modified": "2026-03-02T18:01:56.502000Z",
  "file_hash": "c015fbceacfe1b2d1007697b783865a3d53d7d72250dd80f7210472db54fa0db",
  "private": false,
  "record": {
    "abstract": "A new quantum mechanical notion -- Conditional Density Matrix -- is discussed\nand is applied to describe some physical processes. This notion is a natural\ngeneralization of von Neumann density matrix for such processes as divisions of\nquantum systems into subsystems and reunifications of subsystems into new joint\nsystems. Conditional Density Matrix assigns a quantum state to a subsystem of a\ncomposite system under condition that another part of the composite system is\nin some pure state.",
    "arxiv_id": "quant-ph/0210149",
    "authors": [
      "V. V. Belokurov",
      "O. A. Khrustalev",
      "V. A. Sadovnichy",
      "O. D. Timofeevskaya"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Conditional Density Matrix: Systems and Subsystems in Quantum Mechanics",
    "url": "https://arxiv.org/abs/quant-ph/0210149"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2cf11351-7a00-414a-ac30-fb5a64d600ab",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}