# Bell's theorem

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**Bell's theorem** is a no-go theorem famous for drawing an important line in the sand between quantum mechanics (QM) and the world as we know it classically.

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## Quotes[edit]

- Bell’s theorem is the most profound discovery of science.
- Henry P. Stapp, "Bell's Theorem and World Process",
*Nuovo Cimento*, Vol. 29B, No. 2, p. 270 (1975).

- Henry P. Stapp, "Bell's Theorem and World Process",

- The gist of Bell's theorem is this:
*no local model of reality can explain the results of a particular experiment*.- Nick Herbert
*Quantum Reality - Beyond The New Physics*Chapter 11, The Einstein-Podolsky-Rosen Paradox, p. 199

- Nick Herbert

- Bell himself managed to devise such a proof which rejects all models of reality possessing the property of "locality". This proof has since become known as
*Bells theorem*. It asserts that no local model of reality can underlie the quantum facts.**Bell's theorem says that reality must be non-local.**- Nick Herbert
*Quantum Reality - Beyond The New Physics*Chapter 12, Bell's Interconnectedness Theorem, p. 212

- Nick Herbert

- Physicists continue to debate whether Bell's theorem is airtight or not. However, the real question is not whether Bell can prove beyond doubt that reality is non-local, but whether the world is
*in fact*non-local.- Nick Herbert
*Quantum Reality - Beyond The New Physics*Chapter 13, The Future Of Quantum Reality, p. 238

- Nick Herbert

- There's an interesting scientific principle that a wrong answer can be much more stimulating to the field than just sort of finding the answer that's in the back of the book. A wrong result gets people excited. Worried. Obviously, you don't
*really*want that to be happening—it's OK for a*theorist*to come up with a speculative new theory that gets shot down, but*experimentalists*are supposed to be very careful and their error limits are supposed to be realistic. Unfortunately, with this experiment, whenever you're looking for a stronger correlation, any kind of systematic error you can imagine typically weakens it and moves it toward the hidden-variable range.**It was a hard experiment. In those days, at any rate, with the kind of equipment I had, and ... well, what can I say? I screwed up.**- Michael Horne (physicist), , as quoted by Louisa Gilder, in
*The Age of Entanglement*, Vintage Books, 2008, p. 286: Quote regarding his wrong experimental results that implied that quantum mechanics yielded the wrong prediction regarding Bell's theorem.

- Michael Horne (physicist), , as quoted by Louisa Gilder, in

- No physical theory of local hidden variables can ever reproduce all of the predictions of quantum mechanics.
- C.B. Parker (1994).
*McGraw Hill Encyclopaedia of Physics*(2nd ed.). McGraw Hill. p. 542. ISBN 0-07-051400-3.

- C.B. Parker (1994).

## See also[edit]

## External links[edit]

- Bell's Theorem by Abner Shimony (2004) in the Stanford Encyclopedia of Philosophy.