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Explore the experimental frontiers of quantum mechanics through this 46-minute lecture examining matter-wave interferometry across diverse material classes and increasing mass scales. Delve into how quantum superpositions and extended wave functions of massive objects can be prepared in states that challenge our macroscopic understanding of reality, from C60 molecules to vitamins, polypeptides, molecular clusters, and metal nanoparticles containing thousands of atoms. Discover the experimental conditions, realizations, and applications that confirm quantum superpositions exist in stark contradiction to classical physics assumptions about massive bodies following well-defined trajectories. Learn about the progression from 'Schrödinger kittens' to mesoscopic cats and the next steps in pushing the boundaries between quantum and classical phenomena. Understand how matter-wave interference tools open new avenues for advanced quantum sensing, enabling the probing of tiny forces with applications in physical chemistry, biomolecular physics, and materials science, while grappling with fundamental questions about the meaning of the quantum wave function and its implications for the nature of reality.
