The quantum Fisher information defined via the symmetric logarithmic derivative and the skew information are two different aspects describing the information contents of quantum mechanical density operators. They are considered as natural generalizations of the classical Fisher information and constitute key ingredients in the emerging field of quantum metrology. In this paper, we give the analytical expression of quantum Fisher information and skew information for two-qubit system prepared in a two-qubit state of X type.

中文翻译：

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关于两个量子比特 X 状态的量子 Fisher 信息和偏斜信息的解析推导

通过对称对数导数定义的量子Fisher信息和偏斜信息是描述量子力学密度算子信息内容的两个不同方面。它们被认为是经典 Fisher 信息的自然概括，构成了新兴的量子计量领域的关键成分。在本文中，我们给出了在X型双量子位态下制备的双量子位系统的量子Fisher信息和偏斜信息的解析表达式。