What other experimental evidence exists for entanglement?

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Discussion Overview

The discussion centers around the experimental evidence for quantum entanglement, specifically exploring which properties of particles have been shown to be entangled and the methods used to test these properties. The conversation touches on theoretical implications, such as hidden variables and Bell's Theorem, as well as various experimental contexts.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Gespex asserts that while spin entanglement has substantial evidence, it can be explained using hidden variables, prompting a request for more examples of entangled properties.
  • One participant challenges the notion of hidden variable explanations, suggesting that Bell's Theorem indicates non-local hidden variables are feasible but local ones are not.
  • Another participant clarifies that they are interested in the specific properties of particles that have been tested for entanglement, rather than the types of particles themselves.
  • Participants mention the existence of experimental evidence for entanglement beyond spin, though specific examples are not detailed in the discussion.
  • There is a reference to a paper on hyper-entanglement, suggesting that multiple properties can be entangled simultaneously.
  • Some participants express uncertainty about the implications of Bell's Theorem, indicating a need for further contemplation on the topic.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the ease of explaining entanglement through hidden variables, and there is ongoing debate regarding the implications of Bell's Theorem. The discussion remains unresolved regarding the specific properties tested for entanglement beyond spin.

Contextual Notes

Participants reference various experimental contexts and theoretical frameworks, but specific details about the experiments or the properties tested remain unclear. There is also a lack of consensus on the interpretation of Bell's Theorem and its implications for hidden variables.

gespex
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Hello all,

I know "quantum entanglement" is real, in some sense. I know that if we entangle two particles their spin, for instance, is closely related. Especially spin entanglement has enough evidence, yet it is also easy to explain using a hidden variable.
Hence I wonder: what other experimental evidence is there for entanglement? Which properties have been shown to be entangled, and in what way?


Thanks in advance,
Gespex
 
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gespex said:
Hello all,

I know "quantum entanglement" is real, in some sense. I know that if we entangle two particles their spin, for instance, is closely related. Especially spin entanglement has enough evidence, yet it is also easy to explain using a hidden variable.
Hence I wonder: what other experimental evidence is there for entanglement? Which properties have been shown to be entangled, and in what way?


Thanks in advance,
Gespex

Once you read Bell's Theorem, I would hope you would revise your comment about "easy to explain using a hidden variable". A non-local hidden variable is theoretically feasible, but not with local ones. Are you familiar with Bell?

As to things that can be entangled: there are many things which have been experimentally entangled besides photons. I don't keep track of them specifically, but you can get an idea of papers published this year by scanning some of these:

http://arxiv.org/find/quant-ph/1/abs:+AND+entanglement+experiment/0/1/0/2011/0/1?per_page=100

Here is an older paper you may like:

Hyper-entanglement (more than just spin):
http://arxiv.org/abs/quant-ph/0406148
 
Thank you for your answer. I'm not saying it is easy to introduce a local variable theorem for all of entanglement, only for the entanglement of spin.

I wasn't asking about what kind of particles have been entangled, I know it's not about the particles. But rather, which properties of particles have been tested to be entangled and in what way this test was done.
The only one I am aware of is spin, where the test is "up-spin" or "down-spin" for two distinct axis. But I know others have been tested as well, I just don't know of any such experiments.

I will read the links you posted now.


Thanks
 
gespex said:
Thank you for your answer. I'm not saying it is easy to introduce a local variable theorem for all of entanglement, only for the entanglement of spin...

Bell's Theorem shows that is not possible. See below for a proof (from my website, and I will be glad to answer any questions).

Bell's Theorem with Easy Math
 
DrChinese said:
Bell's Theorem shows that is not possible. See below for a proof (from my website, and I will be glad to answer any questions).

Bell's Theorem with Easy Math

Hmm very interesting link... Maybe I was wrong, but I'm going to have to let it sink in a bit more.

Thanks for your replies!
 

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