{
  "annotation_id": "59838b15-c0ac-4f08-8caf-7a39f60d62c9",
  "date_created": "2026-03-02T18:02:23.221000Z",
  "date_modified": "2026-03-02T18:02:23.221000Z",
  "file_hash": "d8171d63ddfb65918c57b95bcfceece77057353d53e145890c0704c26a0a0496",
  "private": false,
  "record": {
    "abstract": "A system of cascaded qubits interacting via the oneway exchange of photons is\nstudied. While for general operating conditions the system evolves to a\nsuperposition of Bell states (a dark state) in the long-time limit, under a\nparticular resonance condition no steady state is reached within a finite time.\nWe analyze the conditional quantum evolution (quantum trajectories) to\ncharacterize the asymptotic behavior under this resonance condition. A distinct\nbimodality is observed: for perfect qubit coupling, the system either evolves\nto a maximally entangled Bell state without emitting photons (the dark state),\nor executes a sustained entangled-state cycle - random switching between a pair\nof Bell states while emitting a continuous photon stream; for imperfect\ncoupling, two entangled-state cycles coexist, between which a random selection\nis made from one quantum trajectory to another.",
    "arxiv_id": "quant-ph/0602083",
    "authors": [
      "M. Gu",
      "S. Parkins",
      "H. J. Carmichael"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.73.043813",
    "title": "Entangled-state cycles from conditional quantum evolution",
    "url": "https://arxiv.org/abs/quant-ph/0602083"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e3619c4b-cd60-469a-97a6-571378913be0",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}