'Schrödinger's cat and her laboratory cousins' (1984) by A.J. Leggett

Eberly discusses Sir Anthony Leggett's article entitled 'Schrodinger's Cat and her Laboratory Cousins.' Leggett's paper questions whether the superposition principle of quantum mechanics must be a permanent feature of the most fundamental physical theory or not. In particular, Leggett asks, is it possible that size does matter, that people are getting it right when they instinctively feel that there is a macroscopic limit above which superposition should fail. What was really prompted by the thinking people see exhibited in the article, and by its insistence on both the importance and the feasibility of laboratory work, was not one species of experiment but an entire zoo of experiments, unified and motivated by the search for quantum superpositions in tiny but still macroscopic objects.