Characterization of squeezed thermal baths via qubit probe

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 ohmic...

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Bibliographic Details
Published inThe European physical journal. B, Condensed matter physics Vol. 94; no. 6
Main Authors Ullah, Asghar, Anwar, S. Jamal
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2021
Springer
Springer Nature B.V
Subjects
Amplitudes
Complex Systems
Compressing
Condensed Matter Physics
Fisher information
Fluid- and Aerodynamics
Physics
Physics and Astronomy
Qubits (quantum computing)
Regular Article - Statistical and Nonlinear Physics
Solid State Physics
Thermal baths
Thermal environments
Thermodynamic properties
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Summary: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.
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/s10051-021-00145-4