Quantum Mechanics: Understanding Particles at a Distance

In summary: States of particles separated by a large distance can be known through the experimentally verified quantum mechanical result. In fact, the spin of each particle can be determined through the use of statistical deduction in an EPR experiment, where the correlation between two spins is calculated using the singlet state. However, this state is non-local and has been a topic of debate among scientists. Some believe that each EPR particle carries half a quantum state, while others believe that if spin has two axes of quantization, then each spin carries a complete quantum state. This superposition of two axes has eigenvalues of +/- root(2) and can explain the EPR correlation. However, this theory is in disagreement with established science and is not accepted by many.
  • #36
jk22 said:
But this experimental result goes further : we cannot predict with certainty, hence following EPR there is no reason to believe there are elements of reality, the criterion for existence is not anymore fulfilled.

This statement is completely wrong. "Element of reality" is actually a requirement of the Bell proof. And the EPR criteria IS fulfilled experimentally in Bell tests is demonstrated, just not to 100% accuracy. 100% accuracy is not a requirement for any experiment.

What is not demonstrated is that there are *simultaneous* elements of reality. EPR discusses this point as well.
 
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  • #37
i don't mean the accuracy for prediction power. What I mean is that 2.37(prediction is not exact) is MORE accurate than 2.82, where prediction is exact.
 

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