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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Initial quantum correlations among qubits enhance quantum Fisher information for temperature estimation in nonequilibrium Markovian thermalization, with early-time peaks and near-standard-quantum-limit performance for entangled states at high temperatures.
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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.
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Nonequilibrium thermometry via an ensemble of initially correlated qubits
Initial quantum correlations among qubits enhance quantum Fisher information for temperature estimation in nonequilibrium Markovian thermalization, with early-time peaks and near-standard-quantum-limit performance for entangled states at high temperatures.