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Attend this physics colloquium exploring quantum correlations in time and the fundamental concept of macrorealism through the Leggett-Garg framework. Examine how temporal correlations obtained from sequential measurements on single quantum systems challenge classical notions of reality, beginning with a comprehensive review of macrorealism's conceptual foundations and the motivation behind traditional Leggett-Garg inequalities. Discover entropic Leggett-Garg inequalities as an alternative approach that replaces correlation functions with information-theoretic quantities to detect non-classical temporal behavior while addressing measurement invasiveness issues. Explore cutting-edge advances in temporal quantum correlations that push beyond conventional bounds, including scenarios where correlations approach or achieve their algebraic maximum, and understand the physical mechanisms enabling such extremal temporal correlations. Learn how these temporal correlation studies provide deeper insights into quantum foundations while opening new opportunities for quantum information processing applications. The presentation is designed to be accessible to a broad physics audience while maintaining scientific rigor, delivered by Dr. A. R. Usha Devi, a Senior Professor from Bangalore University with nearly 30 years of teaching experience and extensive research contributions in quantum information processing, open quantum systems, and mathematical physics.
