{
  "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 α = 2.47 , which, to our knowledge, exceeds all previously reported values. Our protocol relies on the controlled mixing of the Fock states | 1 ⟩ and | 2 ⟩ 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 ∝ S ^ ( z ) ( | α ⟩ − | − α ⟩ ) , with α = 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 Gottesman-Kitaev-Preskill states, opening perspectives for scalable and fault-tolerant photonic quantum architectures.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "name": "Lucas Caron"
    },
    {
      "name": "Hector Simon"
    },
    {
      "name": "Hugo Basset"
    },
    {
      "name": "Romaric Journet"
    },
    {
      "name": "Rosa Tualle-Brouri"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cwdmb8a7t250z.bib",
  "cited_by": 0,
  "doi": "10.1103/q2h3-58pz",
  "fulltext_url": null,
  "id": "cwdmb8a7t250z",
  "issns": [
    "2160-3308"
  ],
  "landing_url": "https://hal.science/hal-05803467v1",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.phys"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7124261338",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-21",
  "publisher": "American Physical Society",
  "ris": "https://research.draconitic.com/paper/cwdmb8a7t250z.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:58Z",
      "native_id": "hal-05803467",
      "source": "hal",
      "url": "https://hal.science/hal-05803467v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "journal-openalex:3107|Quantum many-body systems",
      "subfield": "amo"
    }
  ],
  "title": "Generation of Large Coherent-State Superpositions in Free-Space Optical Pulses",
  "title_text": "Generation of Large Coherent-State Superpositions in Free-Space Optical Pulses",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:58Z",
  "url": "https://research.draconitic.com/paper/cwdmb8a7t250z",
  "venue": "Physical Review X",
  "versions": []
}