Abstract
The paper concerns some optical phenomena where quantum correlations take place: two-photon and three-photon interference, the photon antibunching, squeezed vacuum. The main properties of quantum correlations are: they do not depend on the distance, do not consume energy, take place for quantum entities both with zero and with nonzero rest mass, take place in the physical vacuum, that is, it is not necessary for the quantum entities to be detected simultaneously. A physical process is discussed which is responsible for quantum correlations in such macrosystem as superfluid 3 He – B . An analogy is shown between the properties of spin supercurrents in superfluid 3 He – B and the above properties of quantum correlations for quantum entities. The important feature of spin supercurrents is that they are not accompanied by any mass transfer.
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