Source: Mankind at the Turning Point, (1974), p. 55; cited in: S.W. Moore, F. Jappe (1980) " Christianity As An Ethical Matrix for No-Growth Economics http://www.asa3.org/ASA/PSCF/1980/JASA9-80Moore.html". In: Journal of the American Scientific Affiliation. Vol 32 (September 1980). pp. 164-168.
“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.”
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
Help us to complete the source, original and additional information
Erwin Schrödinger 67
Austrian physicist 1887–1961Related quotes

“One of the most striking differences between a cat and a lie is that a cat has only nine lives.”

“For all the accomplishments of molecular biology, we still can't tell a live cat from a dead cat.”

Letter https://www.darwinproject.ac.uk/letter/DCP-LETT-2814.xml to Asa Gray, 22 May 1860
Other letters, notebooks, journal articles, recollected statements

from the introduction to Music of the Spheres