Quantum mechanics is the field of physics that explains how extremely small objects simultaneously have the characteristics of both particles (tiny pieces of matter) and waves (a disturbance or variation that transfers energy). Physicists call this the “wave-particle duality.”
This quantum decoherence is the same quantum mechanism that has led, in recent years, to a profound understanding of the macroscopic versus microscopic dichotomy, in which quantum superpositions are virtually unseen in the macroscopic world, while they are the rule in the microscopic world of atoms and elementary particles.