https://doi.org/10.1140/epjb/s10051-021-00145-4
Regular Article - Statistical and Nonlinear Physics
Characterization of squeezed thermal baths via qubit probe
Department of Physics, Quaid-i-Azam University, 45320, Islamabad, Pakistan
Received:
18
March
2021
Accepted:
21
June
2021
Published online:
29
June
2021
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.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2021
