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A comparative study of LQU and LQFI in general qubit-qutrit axially symmetric states
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A comparative study of LQU and LQFI in general qubit-qutrit axially symmetric states
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Journal Article
A comparative study of LQU and LQFI in general qubit-qutrit axially symmetric states
2025
Overview
We derive the compact closed forms of local quantum uncertainty (LQU) and local quantum Fisher information (LQFI) for hybrid qubit-qutrit axially symmetric (AS) states. This allows us to study the quantum correlations in detail and present some essentially novel results for spin-(1/2, 1) systems, the Hamiltonian of which contains ten independent types of physically important parameters. As an application of the derived formulas, we study the behavior of these two quantum correlation measures at thermal equilibrium. New features are observed in their behavior that are important for quantum information processing. Specifically,
cascades
of sudden changes in the behavior of LQU and LQFI are found with a smooth change in temperature or interaction parameters. Interestingly, in some cases, sudden transitions are observed in the behavior of LQU but not in LQFI, and vice versa. Moreover, our compact formulas open a way to apply them to other problems, for instance, when investigating the environmental effects on quantum correlations in open systems.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
