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The variance of an observable in a quantum state is usually used to describeHeisenberg uncertainty relation. For mixed states, the variance includesquantum uncertainty and classical uncertainty. By means of the skew informationand the decomposition of the variance, a stronger uncertainty relation waspresented by Luo in [Phys. Rev. A 72, 042110 (2005)]. In this paper, by usingWigner-Yanase-Dyson information which is a generalization of the skewinformation, we propose a general uncertainty relation of mixed states.

Uncertainty relation of mixed states by means of Wigner-Yanase-Dyson information