Approximative Wigner function for the Helium atom and dissipation
  The Schr\"odinger equation in phase space is used to calculate the Wigner function for the Helium atom in the approximation of a system of two oscillators. Dissipation effect is analysed and the non-classicality of the state is studied by the non-classicality indicator of the Wigner function, which is calculated as a function of the dissipation parameter. 
H. Dessano, R.G.G. Amorim, S.C. Ulhoa, A.E. Santana
quant-ph math-ph math.MP