Does relativistic motion always degrade quantum Fisher information?

@article{Liu2021DoesRM,
  title={Does relativistic motion always degrade quantum Fisher information?},
  author={Xiaobao Liu and Jiliang Jing and Zehua Tian and Weiping Yao},
  journal={Physical Review D},
  year={2021}
}
We investigate the ultimate estimation precision, characterized by the quantum Fisher information, of a two-level atom as a detector which is coupled to massless scalar field in the Minkowski vacuum. It has been shown that for an inertial detector moving with a constant velocity, its quantum Fisher information is completely unaffected by the velocity, however, it still decays over time due to the decoherence caused by the interaction between the atom and the field. In addition, for a uniformly… 
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