论文标题
与Unruh样效应相关的参数的估计精度
Estimation precision of parameter associated with Unruh-like effect
论文作者
论文摘要
我们在开放量子系统中研究加速度的量子渔民信息（QFI），用于两个级别的原子，圆形运动与Minkowski真空中的无质量标量场耦合，没有超相关性极限的无反射边界。随着我们放大$ a $，饱和时间以$θ\neqπ$减少，但首先增加，然后以$θ=π$减少。没有边界，就存在QFI的峰值在一定时间内。 QFI随初始状态参数$θ$而变化，并首先在原子的基础状态下取峰值。 QFI相对于$θ$的变化随时间的演变而逐渐消失。在边界上，加速度的检测范围已扩大。 QFI首先将最大值以原子的激发状态占据。此外，我们研究了浸入没有边界的热浴中的静态原子的温度QFI。饱和时间与$ t $之间的关系类似于$ a $。没有边界，温度的QFI与加速度相似。 QFI首先在原子的基态下采用峰值，这与加速度的行为不同。结果为检测类似于Unruh的效应提供了参考。
We study the quantum Fisher information (QFI) of acceleration, in the open quantum systems, for a two-level atom with the circular motion coupled to a massless scalar field in the Minkowski vacuum without and with a reflecting boundary in the ultra-relativistic limit. As we amplify $a$, the saturation time decreases for $θ\neqπ$, but first increases and then decreases for $θ=π$. Without a boundary, there exists a peak value of QFI with a certain time. The QFI varies with the initial state parameter $θ$, and firstly takes peak value in the ground state of the atom. The variation of QFI with respect to $θ$ gradually fades away with the evolution of time. With a boundary, the detection range of acceleration has been expanded. The QFI firstly takes the maximum in the excited state of the atom. In addition, we study the QFI of temperature for a static atom immersed in a thermal bath without and with a boundary. The relation between the saturation time and $T$ is similar to $a$. Without a boundary, the QFI of temperature is similar to that of acceleration. With a boundary, the QFI firstly takes peak value in the ground state of the atom, which is different from the behavior of acceleration. The results provide references for the detection of Unruh-like effect.
