Abstract
Quantum mechanics is based on description of a state of a physical system in terms of wave function [1] (pure states) and of density matrix [2, 3] (mixed states). The attempts to find a classical-like interpretation of quantum mechanics [4, 5] and related constructions of quasidistribution functions in phase space of the system [6–9] give the idea that for quantum mechanics it is impossible to describe the state of the quantum system in terms of measurable positive probability analogously to the case of classical statistical mechanics, where the state of the system is described by the positive probability distribution due to presence of classical fluctuations.
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