A two-level atom interacting with a single-mode cavity is considered. The atom-cavity system is driven by a classical field with the homodyne-mediated feedback. The influences of the driving field and two types of the feedback on the precision of the phase estimation are investigated. The results show the quantum Fisher information (QFI) can be preserved by the homodyne-mediated feedback and the classical driving when the system parameters are suitable. In addition, the initial value of the relative phase greatly effects the QFI. Therefore, the phase estimation precision of the two-level atom can be enhanced, and the extent of the enhancement is decided by not only the driving frequency and the type of quantum feedback, but also the initial parameters of the two-level system.

中文翻译：

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通过零差介导的反馈和经典驱动提高相位估计的精度

考虑了与单模腔相互作用的两级原子。原子腔系统由具有零差介导的反馈的经典场驱动。研究了驱动场和两种反馈类型对相位估计精度的影响。结果表明，当系统参数合适时，零差介导的反馈和经典驱动可以保留量子Fisher信息（QFI）。此外，相对相位的初始值会极大地影响QFI。因此，可以提高两级原子的相位估计精度，并且增强的程度不仅取决于驱动频率和量子反馈的类型，还取决于二级系统的初始参数。