Assuming nonlocal realism: What message would signal convey?

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Discussion Overview

The discussion revolves around the implications of Bell's inequalities and the nature of realism and locality in quantum mechanics. Participants explore the concepts of nonlocal realism, hidden variables, and the relationship between measurement outcomes and signaling in quantum entanglement.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Exploratory

Main Points Raised

  • Some participants argue that if quantum mechanics is realistic, it must be nonlocal, suggesting that instantaneous signaling is necessary for predetermined measurement outcomes.
  • Others explain that entangled particles exhibit correlations that depend on measurement choices, implying that measurement parameters must somehow influence the second particle.
  • There is a proposal that non-local hidden variables could account for the correlations observed in entangled particles, suggesting that these hidden values are not bound to a specific location.
  • Some participants challenge the notion that realism implies predetermined outcomes, arguing instead that measurement results depend on both the state of the particle and the measurement device.
  • Disagreement exists regarding the definition of locality, with some asserting that theories with a maximum speed of causal influence greater than the speed of light should not be labeled as nonlocal.
  • Participants discuss the implications of hidden variables and their non-locality, suggesting that the information they comprise is non-local and affects measurements at both ends of an entangled system.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the nature of realism and locality in quantum mechanics. There is no consensus on the implications of Bell's theorem or the definitions of local and nonlocal theories.

Contextual Notes

Some arguments rely on specific interpretations of realism and locality, and there are unresolved questions about the nature of measurement outcomes and the role of hidden variables. The discussion reflects a range of interpretations and assumptions that are not universally accepted.

  • #31
DrChinese said:
Why would that be significant to the physics in this case?
I consider that a legitimate question. I am not allowed to respond to that for I haven't got a rigorous theory about it, and probably never will have.

DrChinese said:
Seems like that would be common to any experiment ever.
I was aiming at measurements on entangled systems.
 
Last edited:

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