The provided source, "Quantum Physics: Principles and Applications," offers a comprehensive overview of quantum mechanics, explaining its foundational concepts like wave-particle duality, quantization, superposition, and the probabilistic nature of reality. It traces the historical development of quantum theory, highlighting the failures of classical physics that necessitated its emergence and acknowledging the pivotal contributions of scientists like Planck, Einstein, Bohr, and Schrödinger. The text then details the profound impact of quantum mechanics through two technological revolutions: the first, which harnessed bulk quantum effects to create modern electronics and optics, and the second, an ongoing revolution focused on manipulating individual quantum systems for quantum computing, communication, and sensing. Finally, it addresses the unresolved challenges at the frontiers of quantum physics, particularly the quest to unify quantum mechanics with general relativity in a theory of quantum gravity.

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