In the Dicke model, multiparameter critical metrology achieves square-root divergent scaling for two parameters via higher-order QFIM contributions, while a Dicke dimer with triple point restores quadratic scaling for specific pairs.
Understanding and improving crit- ical metrology: Quenching superradiant light-matter systems beyond the critical point.Quantum, 6:700, 2022
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Multi-Parameter Multi-Critical Metrology of the Dicke Model
In the Dicke model, multiparameter critical metrology achieves square-root divergent scaling for two parameters via higher-order QFIM contributions, while a Dicke dimer with triple point restores quadratic scaling for specific pairs.