“If one has left this entire system to itself for an hour, one would say that the cat still lives if meanwhile no atom has decayed. The psi-function of the entire system would express this by having in it the living and dead cat (pardon the expression) mixed or smeared out in equal parts.”

—  Erwin Schrödinger

On the conditions of the "Schrödinger's cat" thought-experiment, as presented in The Present Situation in Quantum Mechanics (1935), translated by John D. Trimmer http://www.tu-harburg.de/rzt/rzt/it/QM/cat.html

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Erwin Schrödinger67
Austrian physicist 1887–1961

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