Physics – Quantum Physics
Scientific paper
2002-12-17
Acta Phys. Hung. B20 (2004) 29-34
Physics
Quantum Physics
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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