= Wehrl entropy
{wiki=Wehrl_entropy}
Wehrl entropy is a measure of the uncertainty associated with a quantum state, particularly in the context of phase space. It was introduced by the physicist Alfred Wehrl in 1978 as a way to extend the concept of classical entropy to quantum systems. The Wehrl entropy is defined for a quantum state represented by a density operator, typically in the context of continuous variables, such as in quantum optics. In classical thermodynamics, entropy quantifies the level of disorder or uncertainty in a system.
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