Supplementary information

From the following article:

Reconstruction of non-classical cavity field states with snapshots of their decoherence

Samuel Deléglise, Igor Dotsenko, Clément Sayrin, Julien Bernu, Michel Brune, Jean-Michel Raimond & Serge Haroche

Nature 455, 510-514(25 September 2008)

doi:10.1038/nature07288

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Supplementary Movie 1

Fifty milliseconds in the life of a Schrödinger cat. Movie of the reconstructed WF of the even Schrödinger cat state of Fig.3a. The state is reconstructed with the data recorded in a 4ms sliding time-window. The resulting WFs are averaged over 4ms. 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.

Supplementary Movie 2

Schrödinger cats' quantumness vanishes. The even and odd cats have equal classical components and opposite quantum interferences. By subtracting their WFs, we isolate the interference feature displaying their quantumness. Following the same procedure as in Video 1, we present the evolution of this signal over 50 ms which exhibits the fast decay, due to decoherence, of a pure interference pattern.

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