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Wigner phase space distribution as a wave function
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We demonstrate that the Wigner function of a pure quantum state is a wave function in a specially tuned Dirac bra-ket formalism and argue that the Wigner function is in fact a probability amplitude for the quantum particle to be at a certain point of the classical phase space. Additionally, we establish that in the classical limit, the Wigner function transforms into a classical Koopman-von Neumann wave function rather than into a classical probability distribution. Since probability amplitude need not be positive, our findings provide an alternative outlook on the Wigner function's negativity.
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Cited by 1 Pith paper
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Note About Koopman-von Neumann Theory and Density Matrix
The note argues that the classical N-particle distribution equals the diagonal of the density matrix operator in coordinate representation and derives a generalized BBGKY hierarchy for reduced density matrices.
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