Abstract

Dynamics of Quantum Fisher Information in a Squeezed Thermal Bath

Author(s): Asghar Ullah*, Salman Khan, and Khalid Khan

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 optimal temperature of the environment, and the optimal time of interaction, 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. The dynamics show that the sub-ohmic regime may be useful for precise measurements in quantum thermometry