A quantum effect is an effect that is not properly predicted by classical physics, but is properly predicted by quantum mechanics. quantum mechanics describes the behaviour of nature at and below the scale of atoms, where matter and radiation exhibit both particle-like and wave-like properties. These are observed when these properties are significant or dominant, such as in the quantization of energy levels, the uncertainty principle, and the superposition of states. quantum effects are essential for understanding many phenomena in physics, chemistry, biology, and technology.
