%0 Journal Article
%A Shapiro, Dmitrii
%A Weber, Yannik
%A Bode, Tim
%A Wilhelm, Frank K.
%A Bagrets, Dmitry
%T Digital-analog simulations of Schrödinger cat states in the Dicke-Ising model
%J Physical review / A
%V 112
%N 4
%@ 2469-9926
%C Woodbury, NY
%I Inst.
%M FZJ-2025-04032
%P 042412
%D 2025
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1103/wbp6-y3vd
%U https://juser.fz-juelich.de/record/1046964