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Quantum Fisher information affected by fluctuating vacuum electromagnetic field with a boundary

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Abstract

We study the behaviors of quantum Fisher information (QFI) for an accelerated atom interacted with fluctuating electromagnetic vacuum near a perfectly reflecting boundary. The master equation that governs the atom evolution is firstly derived. In the case without boundary, the fluctuation and acceleration of electromagnetic vacuum always attenuate the QFI. Nevertheless, in the presence of a boundary, the degradation, oscillation, and maintaining of QFI are dependent on the atom-boundary distance, acceleration and polarization direction of atom. The boundary can efficiently shield QFI from the impact of the fluctuating electromagnetic vacuum and acceleration in some certain conditions and let us have more freedom of manipulating the precision of parameter estimation.

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Authors and Affiliations

  1. School of Economics and Management, Wuyi University, Jiangmen, 529020, P.R. China

    Zhiming Huang

  2. School of Electronic and Information Engineering, Foshan University, Foshan, 528000, P.R. China

    Zhimin He

  3. Center for Quantum Computing, Peng Cheng Laboratory, Shenzhen, 518055, P.R. China

    Zhimin He

Authors
  1. Zhiming Huang
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  2. Zhimin He
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Correspondence to Zhimin He.

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Huang, Z., He, Z. Quantum Fisher information affected by fluctuating vacuum electromagnetic field with a boundary. Eur. Phys. J. D 74, 127 (2020). https://doi.org/10.1140/epjd/e2020-10149-9

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  • DOI: https://doi.org/10.1140/epjd/e2020-10149-9

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