leggett-garg inequality

The Leggett-Garg inequality is a mathematical expression that examines the behavior of certain physical systems, specifically those that involve quantum mechanics. It provides a way to test whether these systems adhere to the principles of classical physics or if they exhibit quantum properties. The inequality helps to determine if a system can be described in terms of definite values for its properties at different times, which would support classical physics, or if it requires a more probabilistic and indeterminate description, indicating the presence of quantum effects.

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