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The discriminating strength DS(ρAB) induced by local Gaussian unitary operators for any(n + m)-mode Gaussian state ρABis introduced in [Phys. Rev. A 83(2011) 042325]. In this paper, we further discuss the quantity by restricting to Hilbert-Schmidt norm. The analytic formulas of DS for two-mode squeezed thermal states and mixed thermal states are given. Then, the relationship between DS(ρAB) and DS((I ? Φ)(ρAB)) for some special Gaussian channels Φ is discussed. In addition, DS is compared with Gaussian entanglement for symmetric squeezed thermal states. 相似文献
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