In principle, you could demonstrate superposition states of cats the same way you'd demonstrate them for atoms or photons: return the live and dead cats to the

In principle, you could demonstrate superposition states of cats the same way you'd demonstrate them for atoms or photons: return the live and dead cats to the same state, and look for interference fringes. There are two difficult parts. First, you have to kill the cat, rescusitate it, and restore every molecule of its body to the original orbital, without leaving even one photon of evidence. Once you've done that, it's a simple matter of getting the cat to sit still while you measure its position within a tiny fraction of the diameter of an atomic nucleus. I found a fascinating history of the atomic theory at http://www.aare.edu.au/02pap/har02049.htm http://www.aare.edu.au/02pap/har02049.htm, in the section titled "The History of the Particle Theory". Atoms were once as fantastic as superposition states are today, then they gradually became real. The same page points out that the plausibility of atoms is largely a fluke. People imagine that solid gold has the color of a gold atom, and gas pressure comes from squeezing the atoms together. Quantum theory doesn't lend itself to such simple but wrong explanations.