Uncertainty Principle and Quantum Fisher Information - II

Abstract

Heisenberg and Schr{\"o}dinger uncertainty principles give lower bounds for the product of variances $Var_{\rho}(A)\cdot Var_{\rho}(B)$, in a state $\rho$, if the observables $A,B$ are not compatible, namely if the commutator $[A,B]$ is not zero. In this paper we prove an uncertainty principle in Schr{\"o}dinger form where the bound for the product of variances $Var_{\rho}(A)\cdot Var_{\rho}(B)$ depends on the area spanned by the commutators $[\rho,A]$ and $[\rho,B]$ with respect to an arbitrary quantum version of the Fisher information.