Macroscopic quantum state
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A macroscopic quantum state is a state of matter in which macroscopic properties, such as mechanical motion,[1] thermal conductivity, electrical conductivity[2] and viscosity, can be described only by quantum mechanics rather than merely classical mechanics.[3] This occurs primarily at low temperatures where little thermal motion is present to mask the quantum nature of a substance.
Macroscopic quantum phenomena can emerge from coherent states of superfluids and superconductors.[4] Quantum states of motion have been directly observed in a macroscopic mechanical resonator (see quantum machine).