An elementary proof of Wigner theorem on quantum transformations [PDF]
Amaury MouchetAccording to Wigner theorem, transformations of quantum states which preserve the probabilities are either unitary or antiunitary. This short communication presents an elementary proof of this theorem that significantly departs from the numerous ones already existing in the literature. The main line of the argument remains valid even in quantum field theory where Hilbert spaces are non-separable.View original: http://arxiv.org/abs/1304.1376
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