Derives multiparameter sensitivity bounds at thermal equilibrium that achieve the Heisenberg limit and reduce to the known single-parameter case, with distinct low-temperature behavior.
The upper bound is saturated by a pure state that is an equal superposition of the eigenstates corresponding to λ max and λ min
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Sensitivity Bounds of Multiparameter Metrology at Thermal Equilibrium
Derives multiparameter sensitivity bounds at thermal equilibrium that achieve the Heisenberg limit and reduce to the known single-parameter case, with distinct low-temperature behavior.