Semiclassical approaches are inconsistent. (arXiv:1801.03642v1 [quant-ph])
We show that semiclassical theories are inconsistent since evolution
transfers nonclassical features to the classical subsystem and nonquantum
behavior to the quantum subsystem. We specially aim at interaction between
light and a two-level atom, and we also illustrate it via the coupling of two
harmonic oscillators. Quantum and classical systems are treated on the same
grounds via the Wigner-Weyl phase-space correspondence of the quantum theory.