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Explore the fascinating world of quantum superposition through this 48-minute colloquium lecture that delves into the mind-boggling unclassical nature of superposed coherent states. Learn about the fundamental distinction between classically meaningful wavelike coherent states of light and corpuscular number states, then discover how superposing these coherent states creates extraordinary quantum phenomena including "cat states," "comb states," and "compass states." Trace the historical development of superposed coherent states for oscillators, electromagnetic field states, and spin systems, while examining their extension to entangled coherent states. Understand how these quantum states serve as a viable pathway for photonic quantum computing and push the boundaries toward ultimate sensing limits. Gain insights into cutting-edge experimental realizations of superposed coherent states in spin-7/2 Antimony nuclei within silicon substrates, demonstrating the practical implementation of these theoretical concepts in real-world quantum systems.
