Particle confinement, according to quantum-mechanical principles, leads to constructive and destructive interference, which is the origin of quantized energy levels. Terrestrial objects are confined by Earth's gravitational field, but the quantum effects of gravity are not observed in the macro-world because the gravitational interaction is weak. However, very recently an international team at the Institute Laue-Langevin in Grenoble, France, published evidence for the quantized gravitational states of the neutron. This note provides a summary of this remarkable experimental achievement.
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