{
  "annotation_id": "aab9e806-e472-4625-8fa2-65d94c8a7f3a",
  "date_created": "2026-02-17T05:53:20.494000Z",
  "date_modified": "2026-02-17T05:53:20.494000Z",
  "file_hash": "103cd1248591f2275ea0241fa6ef7c4e762ed50f1c1468d791101560d1a79b04",
  "private": false,
  "record": {
    "abstract": "The generation of non-Gaussian quantum states is a key requirement for universal continuous-variable quantum information processing. We report the experimental generation of large-amplitude squeezed coherent-state superpositions (squeezed cat states) on free-space optical pulses, reaching an amplitude of $\\alpha = 2.47$, which, to our knowledge, exceeds all previously reported values. Our protocol relies on the controlled mixing of the Fock states $|1\\rangle$ and $|2\\rangle$ through a tunable beam splitter, followed by heralding via homodyne detection. The resulting state displays three well-resolved negative regions in its Wigner function and achieves a fidelity of $0.53$ with the target state $\\propto \\hat{S}(z)(|\\alpha\\rangle - |-\\alpha\\rangle)$, with $\\alpha = 2.47$ and squeezing parameter $z = 0.56$. These results constitute a significant milestone for temporal breeding protocols and for the iterative generation of optical GKP states, opening new perspectives for scalable and fault-tolerant photonic quantum architectures.",
    "arxiv_id": "2601.09672",
    "authors": [
      "Lucas Caron",
      "Hector Simon",
      "Hugo Basset",
      "Romaric Journet",
      "Rosa Tualle-Brouri"
    ],
    "categories": [
      "quant-ph"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "title": "Generation of Large Coherent-State Superpositions in Free-Space Optical Pulses",
    "url": "https://arxiv.org/abs/2601.09672",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "bdbfe930-1aec-4e72-84b8-943573fecd93",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}