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Bell's Theorem disproved local realism and demonstrated the nonlocal nature of quantum entanglement from "summary" of Simply Quantum Physics by DK
Bell's Theorem shook the foundations of classical physics by challenging the idea of local realism. This concept, which suggests that objects have definite properties regardless of observation, was put to the test in the realm of quantum entanglement. Quantum entanglement is a phenomenon where two particles become connected in such a way that the state of one particle is directly related to the state of the other, no matter the distance between them. Through a series of thought experiments and mathematical calculations, John Bell was able to demonstrate that local realism could not account for the behavior of entangled particles. This led to the conclusion that quantum entanglement operates on a nonlocal level, where the particles are connected instantaneously regardless of the distance separating them. This idea challenged the classical notion of cause and effect, as it suggested that particles could influence each other faster than the speed of light. The implications of Bell's Theorem were profound, as they called into question the very nature of reality as we know it. The idea that particles could be interconnected in this way challenged our understanding of space, time, and causality. It opened up a world of possibilities for the field of quantum physics, suggesting that there may be more to the universe than meets the eye.- Bell's Theorem was a turning point in the study of quantum entanglement, pushing scientists to rethink their assumptions about the nature of reality. By disproving local realism and demonstrating the nonlocal nature of quantum entanglement, Bell challenged us to expand our understanding of the universe and embrace the mysterious world of quantum mechanics.
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