Non-Gaussian nonclassical states
Most nonclassical states that we discussed in Chapters 2 and 3 are Gaussian in the sense that the Wigner function for such states was Gaussian. The only exception to the Gaussian states is the n photon Fock state for which the Wigner function is non-Gaussian and negative for certain domains in the phase space. In this chapter we introduce many other classes of nonclassical states which typically are non-Gaussian.
4.1 Schrödinger cat state and the cat paradox
Schrödinger, in 1935, proposed a thought experiment which shows how quantum-mechanical description can be in contradiction to our everyday experience . He considered a closed box containing a cat, which is a macroscopic object, and a radioactive ...