This drawing by F. Gwynplaine MacIntyre, originally published in Analog magazine, illustrates MacIntyre's science-fiction story "Schrödinger's Cat-Sitter". The cat is depicted simultaneously in front of and behind the impossible trident in an optical illusion.
Schrödinger's cat is a thought experiment, usually described as a paradox, devised by Austrian physicist Erwin Schrödinger in 1935. It illustrates what he saw as absurdities in the views that other physicists had about quantum mechanics (ideas later labeled the Copenhagen interpretation), by applying them not to microscopic objects but to everyday ones. The thought experiment presents a cat that might be alive or dead, depending on an earlier random event. In the course of developing this experiment, he coined the term Verschränkung (entanglement).[1] It was not long before science-fiction writers picked up this evocative concept, often using it in a humorous vein.[2] Works of fiction have employed Schrödinger's thought experiment as plot device and as metaphor, in genres from apocalyptic science fiction to young-adult drama, making the cat more prominent in popular culture than in physics itself.[3][4][5][6]
^E. Schrödinger, Die gegenwärtige Situation in der Quantenmechanik, Naturwissenschaftern. 23: pp. 807–812; 823–823, 844–849. (1935). English translation: John D. Trimmer, Proceedings of the American Philosophical Society 124, pp. 323–38 (1980), reprinted in Quantum Theory and Measurement, p. 152 (1983).