TY  - JOUR
AU  - Shapiro, Dmitrii
AU  - Weber, Yannik
AU  - Bode, Tim
AU  - Wilhelm, Frank K.
AU  - Bagrets, Dmitry
TI  - Digital-analog simulations of Schrödinger cat states in the Dicke-Ising model
JO  - Physical review / A
VL  - 112
IS  - 4
SN  - 2469-9926
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2025-04032
SP  - 042412
PY  - 2025
AB  - 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.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1103/wbp6-y3vd
UR  - https://juser.fz-juelich.de/record/1046964
ER  -