A new study challenges the long-held belief that quantum physics is an exception to the second law of thermodynamics. Researchers at TU Wien suggest that the entropy of a closed quantum system also increases over time until it reaches a peak level.
According to the second law of thermodynamics, the entropy of an isolated system tends to increase over time. Everything around us follows this law; for instance, the melting of ice, a room becoming messier, hot coffee cooling down, and aging — all are examples of entropy increasing over time.Until now, scientists believed that quantum physics is an exception to this law.
This can be achieved using Shannon entropy, a concept proposed by mathematician Claude Shannon in 1948 in his paper titled A Mathematical Theory of Communication. Shannon entropy measures the uncertainty in the outcome of a specific measurement. It tells us how much new information we gain when observing a quantum system. “If there is only one possible measurement result that occurs with 100% certainty, then the Shannon entropy is zero.
QUANTUM PHYSICS THERMODYNAMICS ENTROPY SHANNON ENTROPY QUANTUM SYSTEMS
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