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I try to understand quantum entanglement and especially what it’s called « Action at a distance »
from my understanding, if you have a pair of entangled photon, after measuring the polarization of one photon you will find a correlation between his polarisation and the polarisation of the other photon even if they are very far away from each other.
From there i fail to see the difference between an entangled pair of photon and two magnets in a box (if there are any) , let me explain. What if, we use round magnets in a non-transparent box instead of photons... and use magnetic polarity instead of photon polarization and then perform that experiment :
we place a magnet in two boxes and shake them in a way that there polarity is random an unknown. Then we make a pair of « entangled » magnet by approaching the boxes sufficiently. after “measuring” the polarity (just opening the box and see in which side the magnet is) of one box you will find a correlation between his polarity and the polarity of the magnet in the other box even if they are very far away from each other. (because the two magnets moved in their boxes thanks to the magnetic force when there were close at the ‘entanglement’ step)
The real question is: So is there any difference between my two ‘entangled’ magnet box, and two entangled photons?
As a second question : I suppose, like my magnet box example, that the polarisation (or any quantum property)of two entangled photons is fixed at the entanglement state (still in a random position but correlated), and no real superposition or any 'action at a distance' occurs. Can this statement be false ? Is there any proof or experiment that invalidate this?
Ps : I’ve very limited physic and quantum physic knowledge, and English is not my native language, so some paper may be hard to understand and i apologize for my bad English..