Characterization of squeezed thermal baths via qubit probe

Asghar Ullah () and S. Jamal Anwar
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Asghar Ullah: Quaid-i-Azam University
S. Jamal Anwar: Quaid-i-Azam University

The European Physical Journal B: Condensed Matter and Complex Systems, 2021, vol. 94, issue 6, 1-9

Abstract: Abstract In this paper, we study the dynamics of quantum Fisher information of a qubit interacting with a squeezed thermal environment. We obtain the optimal initial state of the qubit, the temperature of the environment, and the interaction time, which maximize quantum Fisher information. Based on the ohmicity of the environment, we compare the dynamics of quantum Fisher information in ohmic, sub-ohmic, and super-ohmic regimes of the environment. We investigate the estimation of temperature, squeezing amplitude and phase of the environment in detail by studying the behavior of quantum Fisher information. Furthermore, it is shown that the behavior of quantum Fisher information strongly depends on the ohmicity parameter and also the squeezing amplitude of the environment.

Date: 2021
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DOI: 10.1140/epjb/s10051-021-00145-4

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