Fifty milliseconds in the life of a Schrödinger cat. Movie of the reconstructed Wigner function of the even Schrödinger cat state. The state is reconstructed with the data recorded in a 4ms sliding time-window. The resulting Wigner functions are averaged over 4 ms.
The movie exhibits two different phenomena: a fast decay of the quantum interference feature and a much slower evolution of the classical components towards phase-space origin. Fluctuations observed on top of the regular attenuation of the quantum interference term are due to statistical noise.
Since successive frames are not independent, this noise has a 4 ms correlation time (adapted by a video credit: Laboratoire Kastler Brossel, CNRS, http://www.lkb.ens.fr)