{
  "annotation_id": "84732906-dc54-40d0-a7c5-645e2f2932b8",
  "date_created": "2026-03-02T18:01:45.520000Z",
  "date_modified": "2026-03-02T18:01:45.520000Z",
  "file_hash": "7ac678631196b47388f79b28bcb8d9819857d15ed64e2d2c9934275c6b15622f",
  "private": false,
  "record": {
    "abstract": "Entanglement is considered to be one of the most profound features of quantum\nmechanics. An entangled state of a system consisting of two subsystems cannot\nbe described as a product of the quantum states of the two subsystems. In this\nsense the entangled system is considered inseparable and nonlocal. It is\ngenerally believed that entanglement manifests itself mostly in systems\nconsisting of a small number of microscopic particles. Here we demonstrate\nexperimentally the entanglement of two objects, each consisting of about 10^12\natoms. Entanglement is generated via interaction of the two objects - more\nprecisely, two gas samples of cesium atoms - with a pulse of light, which\nperforms a non-local Bell measurement on collective spins of the samples. The\nentangled spin state can be maintained for 0.5 millisecond. Besides being of\nfundamental interest, the robust, long-lived entanglement of material objects\ndemonstrated here is expected to be useful in quantum information processing,\nincluding teleportation of quantum states of matter and quantum memory.",
    "arxiv_id": "quant-ph/0106057",
    "authors": [
      "Brian Julsgaard",
      "Alexander Kozhekin",
      "Eugene S. Polzik"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1038/35096524",
    "title": "Experimental long-lived entanglement of two macroscopic objects",
    "url": "https://arxiv.org/abs/quant-ph/0106057"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2a628d52-6836-48ce-8b5f-2d27738a0cb1",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}