Quantum estimation of acceleration and temperature in open quantum system

TL;DR

This paper investigates how quantum Fisher information (QFI) can be used to optimize the estimation of acceleration and temperature in an open quantum system, revealing effects of boundaries and initial states on measurement precision.

Contribution

It introduces the analysis of QFI behavior in a uniformly accelerated atom near a boundary, showing how boundaries enhance estimation precision and protect initial states.

Findings

QFI peaks at an optimal acceleration, improving estimation accuracy.

Boundaries increase QFI and extend the protection of initial states.

QFI for temperature has a single peak and longer periodicity with boundaries.

Abstract

In an open quantum system, we study the evolution of a two-level atom as a detector which interacts with given environments. For a uniformly accelerated two-level atom coupled to a massless scalar field in the Minkowski vacuum, when it evolves for a certain time, we find that there exists a peak value for the quantum Fisher information (QFI) of acceleration, which indicates that the optimal precision of estimation is achieved when choosing an appropriate acceleration $a$. QFI has different behaviors for different initial state parameters $\theta$ of the atom, displaying periodicity. However, the periodicity fades away with the evolution of time, which means that the initial state cannot affect the later stable quantum state. Furthermore, adding a boundary, we observe that the peak value of QFI increases when the atom is close to the boundary, which shows that QFI is protected by the boundary. Here, QFI fluctuates, and there may exist two peak values with a certain moment, which expands the detection range of the acceleration. Therefore, we can enhance the estimation precision of acceleration by choosing an appropriate position and acceleration $a$. The periodicity of QFI with respect to the initial state parameter $\theta$ lasts a longer time than the previous unbounded case, which indicates that the initial state is protected by the boundary. Finally, for a thermal bath with a boundary, QFI of temperature has no more than one peak value with a certain moment, which is different from QFI of acceleration with a boundary. The periodicity also lasts a longer time than unbounded case, which shows the initial quantum state of the atom is protected by the boundary for two cases.