Abstract
To any parametric family of states of a finite level quantum system we associate a space of Fisher maps and introduce the natural notions of Cramer-Rao-Bhattacharya tensor and Fisher information form. This leads us to an abstract Cramer-Rao-Bhattacharya lower bound for the covariance matrix of any finite number of unbiased estimators of parameteric functions. A number of illustrative examples are included. Modulo technical assumptions of various kinds our methods can be applied to infinite level quantum systems as well as parametric families of classical probability distributions on Borel spaces.
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