We explore the changes of Quantum Fisher information (QFI) for an uniformly accelerating atom coupling to fluctuating massless scalar field with a perfectly reflecting boundary. We first deduce the master equation that the system obeys. For the unbounded case, the vacuum fluctuation and Unruh thermal bath can rapidly degrade the QFI. However, with a boundary, the degradation, preservation, fluctuation and enhancement of QFI are dependent on the evolution time, boundary and acceleration. In addition, the existing boundary can effectively shield QFI from the influence of the vacuum fluctuation and Unruh thermal effect. Especially, the QFI seems to be unaffected by the vacuum fluctuation and acceleration when the atom is very close to the boundary. The efficient control of the boundary and acceleration can provide the feasible scheme of improving the parameter estimation precision.

中文翻译：

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有边界的无质量标量场中的量子Fisher信息

我们探索 Quantum Fisher 信息 (QFI) 的变化，以将均匀加速的原子耦合到具有完美反射边界的波动无质量标量场。我们首先推导出系统服从的主方程。对于无界情况，真空波动和 Unruh 热浴可以迅速降低 QFI。然而，在有边界的情况下，QFI的退化、保存、波动和增强取决于演化时间、边界和加速度。此外，现有的边界可以有效地屏蔽 QFI 免受真空波动和 Unruh 热效应的影响。特别是当原子非常靠近边界时，QFI 似乎不受真空波动和加速度的影响。