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

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The discussion centers on the existence of proof for quantum entanglement beyond Bell's inequalities, which assert that local hidden variables cannot account for quantum correlations. Participants highlight that while Bell's inequalities are significant, they are not entirely conclusive. Other experiments and theoretical frameworks, such as the GHZ theorem and the Bell-Kochen-Specker theorem, also provide insights into quantum entanglement. Additionally, entangled photons are noted for their ability to surpass the diffraction limit, indicating practical applications of entanglement. Overall, the conversation emphasizes the complexity and richness of the evidence supporting quantum entanglement.
San K
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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 variableseven 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?
 
Physics news on Phys.org
Sure! Entangled photons can beat the diffraction limit!

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

Zz.
 
ZapperZ said:
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?
 
San K said:
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/pdf/9706/9706009v1.pdf

Leggett

Hardy's Paradox
 

Thread 'Quantum Entanglement is a Kinematic Fact, not a Dynamical Effect'

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
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