“I liked quantum mechanics very much. The subject was hard to understand but easy to apply to a large number of interesting problems.”

— Willis Lamb

W. E. Lamb, Super classical quantum mechanics: the best interpretation of non relativistic quantum mechanics, Am. J. Phys. 69, 413-422 (2001).

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Willis Lamb5

American Physicist 1913–2008

Leonard Mandel (1927–2001) German physicist

as quoted by John Hogan, in Quantum Philosophy, Scientific American (July 1992)

“The improved understanding of the equations of hydrodynamics is general in nature; it applies to all quantum field theories, including those like quantum chromodynamics that are of interest to real world experiments.”

Shiraz Minwalla (1972) Indian physicist

Interview in The Hindu (2013)
Context: The improved understanding of the equations of hydrodynamics is general in nature; it applies to all quantum field theories, including those like quantum chromodynamics that are of interest to real world experiments. I think this is a good (though minor) example of the impact of string theory on experiments. At our current stage of understanding of string theory, we can effectively do calculations only in particularly simple — particularly symmetric — theories. But we are able to analyse these theories very completely; do the calculations completely correctly. We can then use these calculations to test various general predictions about the behaviour of all quantum field theories. These expectations sometimes turn out to be incorrect. With the string calculations to guide you can then correct these predictions. The corrected general expectations then apply to all quantum field theories, not just those very symmetric ones that string theory is able to analyse in detail.

“The solution of the measurement problem is twofold. First, any observation or measurement requires a macroscopic measuring apparatus. A macroscopic object is also governed by quantum mechanics, but has a large number of constituents, so that each macroscopic state is a combination of an enormous number of quantum mechanical eigenstates. As a consequence the quantum mechanical interference terms between two macroscopic states virtually cancel and only probabilities survive. That is the explanation why our familiar macroscopic physics, concerned with billiard balls, deals with probabilities rather than probability amplitudes.”

Nico van Kampen (1921–2013) Dutch theoretical physicist

The Scandal of Quantum Mechanics (2008)

“Quantum mechanics as it stands would be perfect if we didn't have the quantum-gravity issue and a few other very deep fundamental problems.”

Gerardus 't Hooft (1946) Dutch theoretical physicist and Nobel Prize winner

Does Some Deeper Level of Physics Underlie Quantum Mechanics? An Interview with Nobelist Gerard 't Hooft http://blogs.scientificamerican.com/critical-opalescence/2013/10/07/does-some-deeper-level-of-physics-underlie-quantum-mechanics-an-interview-with-nobelist-gerard-t-hooft/

“It has always seemed to me that the hard thing to understand is not quantum mechanics, but where classical mechanics comes from (in the sense of how it emerges from a “measurement”).”

Peter Woit (1957) American physicist

Not Even Wrong (blog)

“It's kind of interesting to show that the strange features of quantum mechanics are actually observed. We still don't totally understand what it means.”

Leonard Mandel (1927–2001) German physicist

as quoted by James Glanz, in Leonard Mandel, 73, Revealer Of Light's Weirdness, Is Dead http://www.nytimes.com/2001/02/13/nyregion/leonard-mandel-73-revealer-of-light-s-weirdness-is-dead.html?sec=&spon=, New York Times (Tuesday, February 13, 2001)

“I think I can safely say that nobody understands quantum mechanics.”

Richard Feynman book The Character of Physical Law

Variant: I think I can safely say that nobody understands quantum mechanics.
Source: The Character of Physical Law (1965), chapter 6, “Probability and Uncertainty — the Quantum Mechanical View of Nature,” p. 129

“Considering the pervasive importance of quantum mechanics in modern physics, it is odd how rarely one hears of efforts to test quantum mechanics experimentally with high precision.…The trouble is that it is very difficult to find any logically consistent generalization of quantum mechanics. One obvious target for generalization is the linearity of quantum mechanics, but if we arbitrarily add nonlinear terms to the Schrodinger equation, how do we know that the theory we obtain will have a sensible physical interpretation? At least in part, it is the dearth of generalized versions of quantum mechanics that has made it so hard to plan experimental tests of quantum mechanics.”

Steven Weinberg (1933) American theoretical physicist

"Testing Quantum Mechanics" http://www.sciencedirect.com/science/article/pii/0003491689902765, Annals of Physics (1989)

“Nature isn't classical, dammit, and if you want to make a simulation of nature, you'd better make it quantum mechanical, and by golly it's a wonderful problem, because it doesn't look so easy.”

Richard Feynman (1918–1988) American theoretical physicist

" Simulating Physics with Computers http://www.cs.berkeley.edu/~christos/classics/Feynman.pdf", International Journal of Theoretical Physics, volume 21, 1982, p. 467-488, at p. 486 (final words)

“The real problem in Italy is the wall on the subject: I worked with the French (the numbers one for the hard), the Americans, the Spaniards, the Germans but only the Italians make a thousand problems …”

Rocco Siffredi (1964) Italian pornographic actor, director, producer and entrepreneur

Interview by Andrea Di Marcantonio

“I liked quantum mechanics very much. The subject was hard to understand but easy to apply to a large number of interesting problems.”

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Willis Lamb5

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