Above a critical parametric drive, a cross-Kerr-coupled resonator chain enters a nonlinearity-dictated topological phase with spontaneous symmetry breaking and non-trivial bulk-boundary correspondence.
Ashhab, Superradiance transition in a system with a single qubit and a single oscillator, Phys
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Spectral collapse in the anisotropic two-photon quantum Rabi model is a genuine continuous quantum phase transition governed by a soft mode with zν = 1/2, placing it in the universality class of the standard Rabi model.
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Quantum criticality from spectral collapse in the two-photon Rabi model
Spectral collapse in the anisotropic two-photon quantum Rabi model is a genuine continuous quantum phase transition governed by a soft mode with zν = 1/2, placing it in the universality class of the standard Rabi model.