Eistein Podosky Rosen extended

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The modified EPR experiment proposes a setup with entangled positron and electron pairs to measure spin correlations using Stein-Gerlach detectors. The arrangement suggests that measuring the spin of one particle could reveal correlations with its entangled partner, aligning with the Copenhagen interpretation of quantum mechanics. The discussion highlights the potential to challenge locality without relying on Bell's theorem, as synchronization pulses would precede the creation of the particle pairs. However, concerns arise regarding the conservation of spin and angular momentum, given that the annihilation products have a net spin of zero. This experiment raises intriguing questions about the foundations of quantum mechanics and the nature of entanglement.
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This is a question about a slightly modified version of the EPR experiment:

The experiment requires:
A source of entangled positron pairs
A source of entangels electron pairs
A pair of Stein-Gerlach type spin orientation detectors.

Let's say that there is a linear arrangement of
Detector - Positron source - Annihillation Chamber - Electron Source - Detector

And, I try to measure correlation between spin states of the electron at one end, and the positron at the other in a fashion similar to that of the EPR experiment.

Does QM - if it matters let's say the Copenhagen interpretation - indicate that there will be spin corellation between the pairs?

This experiment is interesting to me because it creates a situation where Bell's theorem may not be necessary to eliminate locality. Since any 'synconization pulse' would have to have taken place before the electron/postitron pair came into existence. On the other hand, AFAIK, the products of the Positron/Electron interaction have net spin zero, so a lack of correlation would indicate a violation of conservation of spin/angular momentum.
 
So I know that electrons are fundamental, there's no 'material' that makes them up, it's like talking about a colour itself rather than a car or a flower. Now protons and neutrons and quarks and whatever other stuff is there fundamentally, I want someone to kind of teach me these, I have a lot of questions that books might not give the answer in the way I understand. Thanks
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