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Anthony James Leggett: Explorer of quantum mechanics, from fluids and solids to the macroscopic world

Baym G, Fradkin E

Proceedings of the National Academy of Sciences of the United States of America, 2026

Abstract

Tony Leggett (1938-2026) was one of the great theoretical physicists of his generation, specializing in the quantum mechanics of fluids and solids. Rightly recognized by the 2003 Nobel Prize in Physics for his explanation of the experiments discovering the superfluidity of helium-3, he will be remembered equally for his pioneering inquiries into the transition from the quantum to the classical world and the extent to which we can observe quantum phenomena on macroscopic scales.

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