Ultimate precision bounds for multiparameter Markovian noise metrology show average variance scaling as Ω(1/(T R²)) with Heisenberg scaling in dissipative channels R when using entangled probes and high-rank signal correlations, attainable via rapid prepare-and-measure protocols.
Pezzè and A
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Introduces semi-classical geometric tensor relating quantum geometric tensor to classical Fisher information matrix and proves a sharpened matrix inequality for multiparameter quantum bounds.
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.
OH molecule proposed as quantum probe for joint electric and magnetic field estimation, with optimized stationary and dynamical protocols that address incompatibility and show temperature effects on error.
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Precision Limits of Multiparameter Markovian-Noise Metrology
Ultimate precision bounds for multiparameter Markovian noise metrology show average variance scaling as Ω(1/(T R²)) with Heisenberg scaling in dissipative channels R when using entangled probes and high-rank signal correlations, attainable via rapid prepare-and-measure protocols.
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Semi-classical geometric tensor in multiparameter quantum information
Introduces semi-classical geometric tensor relating quantum geometric tensor to classical Fisher information matrix and proves a sharpened matrix inequality for multiparameter quantum bounds.
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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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OH molecule as a quantum probe to jointly estimate electric and magnetic fields
OH molecule proposed as quantum probe for joint electric and magnetic field estimation, with optimized stationary and dynamical protocols that address incompatibility and show temperature effects on error.