{
  "annotation_id": "6a17c5d6-bb38-4539-8274-d6b4c170cf88",
  "date_created": "2026-03-02T18:02:41.541000Z",
  "date_modified": "2026-03-02T18:02:41.541000Z",
  "file_hash": "46db982eae0cf5a01afb6b6c6ab3f4e13c4c8ebe82eb88b6d0e698b2d9d772a7",
  "private": false,
  "record": {
    "abstract": "This paper discusses fully coherent quantum feedback control, in which the\nsensors, controller, and actuators are quantum systems and interact coherently\nwith the system to be controlled: as a result, the entire feedback loop is\ncoherent. Unlike conventional semiclassical feedback control of quantum\nsystems, feedback control by quantum controllers is not stochastic, preserves\nthe initial state of the controlled system, and can control quantum systems in\nways that are not possible using conventional, incoherent feedback control. In\nparticular, the target state to which the quantum controller drives the system\ncan be entangled with another quantum system. This paper investigates quantum\ncontrollers and states necessary and sufficient conditions for a Hamiltonian\nquantum system to be observable and controllable by a quantum controller.",
    "arxiv_id": "quant-ph/9703042",
    "authors": [
      "Seth Lloyd"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Quantum controllers for quantum systems",
    "url": "https://arxiv.org/abs/quant-ph/9703042"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "42005df8-d443-416b-9519-83a85dd3ad45",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}