Two-qutrit quantum Rabi model is integrable under specific conditions, allowing derivation of ground-state phase diagram with level crossings and superradiant quantum phase transition.
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Adding an auxiliary nonlinear term to the quantum Rabi model extends its quantum phase transition into a continuous regime, yielding globally diverging quantum Fisher information and criticality-enhanced metrology precision in dynamics that persists with decoherence.
A general quantity from Landau free energy shows superradiant transitions can enhance or suppress fermionic pairing and superconducting gaps in two-order-parameter systems, as verified in Rabi and Dicke models.
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Level crossings and superradiant quantum phase transition for a two-qutrit quantum Rabi model
Two-qutrit quantum Rabi model is integrable under specific conditions, allowing derivation of ground-state phase diagram with level crossings and superradiant quantum phase transition.
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Globalized critical quantum metrology in dynamics of quantum Rabi model by auxiliary nonlinear term
Adding an auxiliary nonlinear term to the quantum Rabi model extends its quantum phase transition into a continuous regime, yielding globally diverging quantum Fisher information and criticality-enhanced metrology precision in dynamics that persists with decoherence.
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Superradiance enhances and suppresses fermionic pairing based on universal critical scaling in two order parameters systems
A general quantity from Landau free energy shows superradiant transitions can enhance or suppress fermionic pairing and superconducting gaps in two-order-parameter systems, as verified in Rabi and Dicke models.