Quantum correlations in general qubit–qudit axially symmetric states

The article explores the fascinating realm of quantum correlations in axially symmetric states, focusing on the current state of quantum computing known as the noisy intermediate-scale quantum (NISQ) era. It delves into the significance of quantum correlations, which are believed to drive the speedup of quantum computers, and discusses various measures of quantum correlations, with a particular emphasis on quantum discord and its extensions. The study investigates the behavior of quantum correlations in mixed spin-(1/2, S) systems, providing analytical expressions for local quantum uncertainty (LQU) and local quantum Fisher information (LQFI) that are both compact and computationally efficient. The article also examines the impact of temperature on quantum correlations, revealing intriguing phenomena such as temperature-induced quantum correlations and abrupt transitions. Furthermore, it analyzes the behavior of quantum correlations in specific models, such as the Heisenberg XXZ model, and discusses the potential applications of these findings in quantum thermodynamics and quantum information processing. The detailed exploration of these topics makes the article a compelling read for those interested in the cutting-edge developments in quantum information technologies.