Quantum Fisher information for two-qubit XY spin-chain: individual characterization of different parameters

The effects of an externally applied magnetic field on a two-qubit spin chain XY model are investigated. Magnetic field strength, Dzyaloshinskii–Moriya interaction strength, isotropic parameter, and temperature are all used effectively in this field. We use quantum Fisher information (QFI), which estimates the role of each parameter for adequate characterization and realistic use of each parameter. The magnetic field strength, Dzyaloshinskii–Moriya interaction, isotropic parameter, and temperature affect the QFI function. Our findings show that the significantly characterized aspect of the field influences the parameters and the system-field coupling. For example, when the current areas are defined by temperature, we can see that the QFI function has a very high maximum level. As a result, we’ve presented some examples of this type and various parameter optimizations for the QFI function, which we believe will help improve practical quantum mechanical protocols.