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Do we have any proof of entanglement other than bells inequalities?

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San K
#1
Jun22-11, 12:45 PM
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do we have any proof of entanglement other than Bells Inequalities?


bell's inequalities says that:

- no physical theory of local hidden variables can reproduce all of the predictions of quantum mechanics

or in other words

- the correlations in/during Quantum Entanglement (QE) are stronger than could be explained by local hidden variables


even Bell's inequalities are not totally conclusive

is there any other experiment/observation/theoretical-mathematical deduction that would show/prove, or even hint, the existence of QE?
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ZapperZ
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Jun22-11, 12:52 PM
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Sure! Entangled photons can beat the diffraction limit!

http://physicsworld.com/cws/article/news/19514

Zz.
San K
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Jun22-11, 12:58 PM
P: 915
Quote Quote by ZapperZ View Post
Sure! Entangled photons can beat the diffraction limit!

http://physicsworld.com/cws/article/news/19514

Zz.
ok....cool link.

is there a way to reduce the wavelength of a photon other than by entanglement?

DrChinese
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Jun22-11, 01:20 PM
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Do we have any proof of entanglement other than bells inequalities?

Quote Quote by San K View Post
bell's inequalities says that:

- no physical theory of local hidden variables can reproduce all of the predictions of quantum mechanics

...
Well said!

Entanglement is used as a tool to demonstrate the above statement as being true. There are other techniques, separate from the usual Bell tests, as well. I might recommend you check out these subjects which are closely related (Wiki has articles on these too):

GHZ Theorem (a very complex proof but very convincing)
http://www.drchinese.com/David/Bell-MultiPhotonGHZ.pdf

Bell-Kochen-Specker (don't be fooled by the name, this is different than Bell's Theorem)
http://arxiv.org/PS_cache/quant-ph/p.../9706009v1.pdf

Leggett

Hardy's Paradox


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