For a photon redshifted in curved spacetime and subjected to amplitude-damping or Ohmic-like dephasing, the Nagaoka bound is the tightest multiparameter estimation limit, with best precision in the strong-coupling and sub-Ohmic regimes.
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Multiparameter quantum estimation in a photon system induced by gravitational redshift
For a photon redshifted in curved spacetime and subjected to amplitude-damping or Ohmic-like dephasing, the Nagaoka bound is the tightest multiparameter estimation limit, with best precision in the strong-coupling and sub-Ohmic regimes.