Kurt Gottfried Quotes (1929-2022)

Scientist

About Kurt Gottfried

Kurt Gottfried (May 17, 1929 – August 25, 2022) was professor emeritus of physics at Cornell University, known for his work in the areas of quantum mechanics and particle physics. He was also a co-founder with Henry Way Kendall of the Union of Concerned Scientists.

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“On further reflection, I now think that in arguing his case Bell exaggerated, oversimplified the historical development of both classical electrodynamics and quantum mechanics, and as a result arrived at a definition of "understanding" that may be too rigid in that it reflects a presumption - a prejudice, if you will - as to what constitutes physical reality.”
Kurt Gottfried
“By taking issue with Bell on this score, I am not saying that I am satisfied with my understanding of quantum mechanics. I share Feynman's belief that no one really understands quantum mechanics. But we should not exaggerate our embarrassment; it is ample as it stands. In any event, I agree with Bell that the foundations continue to merit the closest scrutiny.”
Kurt Gottfried
“I, for one, remain unpersuaded that a crisis of major proportions has been identified, but at the same time I am open to the possibility that such a crisis has been glimpsed, though perhaps only subliminally, by Bell and his great predecessors: Einstein, Schrodinger, de Broglie, Bohm and Wigner. This is a roster which should give us all pause. To my understanding, however, this crisis has not yet been formulated with sufficient precision to facilitate the birth of a great offspring.”
Kurt Gottfried
“That classical theory had catastrophic implications for the constitution of matter was barely appreciated by Planck and others at the turn of the century, and played no substantial role in the development of quantum theory until Bohr's work 13 years later.
The lesson that could be drawn from this, and also from the development of general relativity, is that a crisis will only become creative if it is formulated in a mathematically precise manner. This conclusion has an echo in Bell's insistence on having quantum mechanics "fully formulated in mathematical terms, with nothing left to the discretion of the theoretical physicist", but what it really calls for is a critique of the "orthodox" theory fully formulated in mathematical terms with nothing left to the discretion of the critic.”
Kurt Gottfried

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Kurt Gottfried on Measurement in quantum mechanics

“Hence coherence survives to the extent to which an experiment fails to distinguish between different eigenvalues of the observable being measured, and distinct final states of the object display interference if the final states of the apparatus overlap. […] When the apparatus ends up in one member of a set of orthogonal states, the experiment unambiguously determines whether or not the object is then in a particular eigenstate of the observable of interest, but the result becomes increasingly ambiguous with increasing overlap between the states of the apparatus; furthermore, states of the object with distinct eigenvalues interfere with a visibility that is a measure of the ambiguity with which the states assumed by the apparatus determine the states of the object.”

About Kurt Gottfried

Kurt Gottfried (May 17, 1929 – August 25, 2022) was professor emeritus of physics at Cornell University, known for his work in the areas of quantum mechanics and particle physics. He was also a co-founder with Henry Way Kendall of the Union of Concerned Scientists.