Information transfer using entanglement?

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Discussion Overview

The discussion revolves around the possibility of transferring information using entangled particles, specifically focusing on the implications of measurement angles on outcomes in entangled systems. Participants explore theoretical aspects, potential models, and the relationship between measurements at two detectors, A and B, in the context of quantum entanglement.

Discussion Character

  • Exploratory
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Some participants argue that measurements on an entangled system do not transmit information, regardless of the speed of measurement.
  • Others propose that changing the measurement angle at detector A could lead to different outcomes at detector B, suggesting a potential correlation that might imply some form of information transfer.
  • One participant mentions that without information from A, it is impossible to determine if B is entangled with A, reinforcing the idea that entanglement cannot be used for faster-than-light communication.
  • Another viewpoint is that entanglement can be utilized for super-dense coding, allowing more information to be encoded than is possible without entanglement.
  • Several participants present trials with specific angles and outcomes, discussing whether varying the settings at A affects the results at B, with some asserting that correlations depend on specific angles.
  • There is a suggestion that combining outcomes from different pairs of measurements may not yield valid correlations, raising questions about the independence of measurements.
  • One participant emphasizes that the observed statistics change with varying angles for entangled pairs, but the interpretation of whether outcomes at B are affected by changes at A remains uncertain.

Areas of Agreement / Disagreement

Participants express differing views on whether changing the measurement angle at A affects outcomes at B, with some asserting that it does while others maintain that it does not. The discussion remains unresolved regarding the implications of these measurements and the nature of information transfer in entangled systems.

Contextual Notes

There are limitations in the discussion regarding assumptions about the independence of measurements and the specific conditions under which correlations are observed. The precise mechanics of how measurement angles influence outcomes are not fully understood, contributing to the ongoing debate.

  • #31
@morrobay: thanks for your example in post #15 and the example in the paper. I am sorry, with all due respect, but I am not sure what you are saying here. Are you saying that the outcomes are interdependent, and that they are not dependent on the settings?

Then I would agree, with the caveat that the outcomes may depend on the settings. :smile:

I think that there is - in principle - not enough information to establish how the outcomes are created. The situation is symmetrical, so it could go either way. B depends on A and vice versa. However, that is my point: because there is not enough information in principle, that leaves room for the possibility that B (outcomes) depends on A (outcomes/settings). However, because the opposite is also possible, it seems difficult if not impossible to substantiate a claim of causality or even influence.

That said, I think the outcomes depend on the settings, because the correlation depends on the settings. So if one were to rule out 'an effect' (non-locality) one would have to stick with the outcomes depending on the local settings (like you seem to do?). One step further is to suggest that the outcomes might interdepend non-locally (of 'the other' settings), like I do. :smile:
 
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