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@ARTICLE{Shapiro:1046964,
      author       = {Shapiro, Dmitrii and Weber, Yannik and Bode, Tim and
                      Wilhelm, Frank K. and Bagrets, Dmitry},
      title        = {{D}igital-analog simulations of {S}chrödinger cat states
                      in the {D}icke-{I}sing model},
      journal      = {Physical review / A},
      volume       = {112},
      number       = {4},
      issn         = {2469-9926},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2025-04032},
      pages        = {042412},
      year         = {2025},
      abstract     = {The Dicke-Ising model, one of the few paradigmatic models
                      of matter-light interaction, exhibits a superradiant quantum
                      phase transition above a critical coupling strength.
                      However, in natural optical systems, its experimental
                      validation is hindered by a “no-go theorem.” Here, we
                      propose a digital-analog quantum simulator for this model
                      based on an ensemble of interacting qubits coupled to a
                      single-mode photonic resonator. We analyze the system's
                      free-energy landscape using field-theoretical methods and
                      develop a digital-analog quantum algorithm that disentangles
                      qubit and photon degrees of freedom through a
                      parity-measurement protocol. This disentangling enables the
                      emulation of a photonic Schrödinger cat state, which is a
                      hallmark of the superradiant ground state in finite-size
                      systems and can be unambiguously probed through the Wigner
                      tomography of the resonator's field.},
      cin          = {PGI-12},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-12-20200716},
      pnm          = {5221 - Advanced Solid-State Qubits and Qubit Systems
                      (POF4-522) / ML4Q - Machine Learning for Quantum (101120240)
                      / Verbundprojekt: Digital-Analoge Quantencomputer (DAQC) -
                      Teilvorhaben: DAQC Kontrolle, Kalibrierung und
                      Charakterisierung (13N15688) / BMBF 13N16149 - QSolid -
                      Quantencomputer im Festkörper (BMBF-13N16149)},
      pid          = {G:(DE-HGF)POF4-5221 / G:(EU-Grant)101120240 /
                      G:(BMBF)13N15688 / G:(DE-Juel1)BMBF-13N16149},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/wbp6-y3vd},
      url          = {https://juser.fz-juelich.de/record/1046964},
}