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.
Each generator has the structure Hk =ǫk Nk∑ i=1 hk,i, ǫ k = sgn(nk), (D5) wherehk,i has eigenvalues± 1/ 2
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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.