Erwin Schrodinger — "The present quantum mechanics is not a theory in the sense of the old theories, …"

The present quantum mechanics is not a theory in the sense of the old theories, but rather a collection of rules for the calculation of probabilities.
Erwin Schrodinger — Erwin Schrodinger Modern · Wave mechanics

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About Erwin Schrodinger (1887-1961)

Austrian physicist who shared the 1933 Nobel for the wave equation that bears his name and the famous cat thought-experiment. Closely associated with Werner Heisenberg (matrix-mechanics rival who reached the same physics by different math) and Albert Einstein (his pen-pal on quantum interpretation). For an intellectual contrast, see Niels Bohr, Danish physicist and architect of the Copenhagen interpretation — Schrödinger's cat thought-experiment was specifically designed to ridicule Bohr's 'observer-dependent reality' reading of quantum mechanics — Schrödinger thought the Copenhagen interpretation was absurd; the cat was meant as reductio ad absurdum.

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My View of the World

Date: 1961

Educational

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Understanding this quote

What it means

Quantum mechanics doesn't explain reality the way classical physics does — it doesn't tell you why or how things happen, only how likely they are to happen a certain way. Traditional theories gave causal mechanisms; quantum mechanics gives probabilities. Schrödinger is flagging that despite its predictive power, quantum mechanics lacks the explanatory depth of a real theory — it's a powerful calculating tool, not a complete picture of physical reality.

Relevance to Erwin Schrodinger

Schrödinger invented wave mechanics in 1926 hoping to give quantum theory a more intuitive, continuous physical picture — he hated pure probabilism. His famous Schrödinger's cat paradox was a direct protest against Copenhagen's probabilistic interpretation. He collaborated with Einstein, who shared his unease. This quote captures his lifelong dissatisfaction: he believed quantum mechanics was incomplete, a placeholder until physics found a deeper, truly explanatory theory of nature.

The era

In the 1920s–30s, physics was being revolutionized by quantum theory, which abandoned the determinism of Newton and even Einstein. The Copenhagen interpretation — championed by Bohr and Heisenberg — declared probability fundamental to nature, not merely a reflection of ignorance. Einstein's 'God does not play dice' captured widespread unease. Schrödinger's statement echoes that era's profound discomfort: brilliant physicists were simultaneously building and doubting a framework that worked without anyone fully understanding what it meant.

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