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

In summary, while Bell's inequalities provide strong evidence for the existence of Quantum Entanglement, there are other experiments and theories such as the GHZ Theorem, Bell-Kochen-Specker, Leggett, and Hardy's Paradox that also support its existence. Additionally, the use of entangled photons has shown that they can beat the diffraction limit, providing further proof of entanglement. However, there are currently no other known methods for reducing the wavelength of a photon other than through entanglement.
  • #1
San K
911
1
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?
 
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  • #2
Sure! Entangled photons can beat the diffraction limit!

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

Zz.
 
  • #3
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?
 
  • #4
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
 

1. What is entanglement and why is it important in science?

Entanglement is a phenomenon in quantum mechanics where two or more particles become connected in such a way that the state of one particle affects the state of the other, regardless of the distance between them. It is important in science because it challenges our understanding of causality and has potential applications in quantum computing and communication.

2. What is the evidence for entanglement other than Bell's inequalities?

There is strong evidence for entanglement through experiments such as the EPR paradox, quantum teleportation, and violation of the CHSH inequality. Additionally, entanglement plays a crucial role in many quantum technologies, providing practical evidence for its existence.

3. How do scientists create entangled particles in the laboratory?

Entangled particles can be created through various methods, such as spontaneous parametric down-conversion, quantum dots, and superconducting circuits. These methods rely on the principles of quantum mechanics to entangle particles and have been successfully demonstrated in laboratory experiments.

4. Can entanglement be observed in everyday objects?

No, entanglement is a phenomenon that occurs at the quantum level and cannot be observed in everyday objects. It requires precise control and measurement at the atomic or subatomic level, which is not possible with macroscopic objects.

5. How is entanglement relevant to the concept of superposition?

Superposition is a fundamental concept in quantum mechanics, where a particle can exist in multiple states simultaneously. Entanglement is closely related to superposition, as entangled particles are in a combined state that cannot be described by the individual states of each particle. This means that entangled particles can exhibit superposition, further demonstrating the strange and counterintuitive nature of quantum mechanics.

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