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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Multiensemble superradiance yields dark states with inter-ensemble entanglement whose covariance matrices in the large-N limit optimize multiparameter spin squeezing via the Rayleigh quotient of the squeezing matrix.
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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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Multiensemble Superradiance for Distributed Quantum Sensing
Multiensemble superradiance yields dark states with inter-ensemble entanglement whose covariance matrices in the large-N limit optimize multiparameter spin squeezing via the Rayleigh quotient of the squeezing matrix.