Wigner Centennial: His Function, and Its Environmental Decoherence

Physics – Quantum Physics

Scientific paper

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6pp, talk at Wigner Centennial Conf. (Pecs, Hungary)

Scientific paper

In 1983, Wigner outlined a modified Schr\"odinger--von-Neumann equation of motion for macroobjects, to describe their typical coupling to the environment. This equation has become a principal model of environmental decoherence which is beleived responsible for the emergence ofclassicality in macroscopic quantum systems. Typically, this happens gradually and asymptotically after a certain characteristic decoherence time. For the Wigner-function, however, one can prove that it evolves perfectly into a classical (non-negative) phase space distribution after a finite time of decoherence.

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