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.
Multi- parameter estimation beyond quantum Fisher information.J
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Optimizing the squeezing phase in a correlated squeezed-thermal reservoir maximizes quantum Fisher information for phase and correlation parameters and reduces joint-estimation variance.
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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.
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From Independent to Joint: Enhancing Quantum Phase and Correlation Factor Estimation by Squeezed Reservoir Engineering
Optimizing the squeezing phase in a correlated squeezed-thermal reservoir maximizes quantum Fisher information for phase and correlation parameters and reduces joint-estimation variance.