Effect of inserting an analyzer loop in the EPR experiment

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    Epr Experiment Loop
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Discussion Overview

The discussion revolves around the effect of inserting an analyzer loop in the EPR experiment, specifically in the context of Alain Aspect's 1982 test of non-locality using photons. Participants explore whether the presence of a polarizer and its inverse would influence the non-local correlations observed between entangled photons.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions if inserting an analyzer loop would still result in non-local correlations between entangled photons.
  • Another participant references an analysis suggesting that the outcome would remain unchanged, indicating that the Bell violation would still be observed regardless of the analyzer loop's presence.
  • A third participant expresses confusion about the implications of the analysis and seeks clarification on whether the analyzer loop affects the results.
  • A later reply confirms that non-local correlations would still be observed with the analyzer loop, although the participant notes a lack of experimental demonstrations to support this claim.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the implications of the analyzer loop. While some suggest it does not affect the outcome, others express uncertainty and seek clarification, indicating that multiple views remain in the discussion.

Contextual Notes

There is a mention of a lack of experimental realization of the proposed setup, which may limit the discussion's conclusions. Additionally, the analysis referenced may depend on specific assumptions about the behavior of the analyzer loop.

kurt101
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TL;DR
Does inserting an analyzer loop in the EPR experiment with photons affect the non-local correlation in this experiment?
Given an EPR experiment such as the Alain Aspect 1982 test of non-locality using photons; if you modified the experiment so that the entangled photons first go through a analyzer loop (polarizer + inverse polarizer) before going to the polarizers in the experiment would you still see a non-local correlation between the entangled photons in this experiment?

A loop analyzer is a polarizer and its inverse polarizer that does not change the polarization as show in the following diagram:

loop-analyzer.png
 
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DrChinese said:
According to this analysis, it would:
"It would" what? I did a first read through the thought experiment you posted and my understanding is that an analyzer loop that looks like:
loop-analyzer2.PNG

has no effect on the outcome and you still get the Bell violation whether it is there or not. Am I misunderstanding?

Thanks
 

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Sorry, I wasn't clear: "Would you still see a non-local correlation between the entangled photons in this experiment?"

Yes, you would. The only issue is that I am not aware of an experimental demonstration of this. But maybe someone else knows... :smile: and I would love to see that.
 
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