The fact is surprising when coupled with the fact that particles do not have a definite spin direction before you measure it. The anti-correlation is maintained non-locally, but the directions are decided by the experiment.
A better example is: take two spheres, send them far away, then make one sphere spin in any orientation that you want. How much would you be surprised to learn that the other sphere spins with the same axis in the opposite directions?
This is the correct answer to the question. Bell and CHSH and all are remarkable but more complicated setups. This—entanglement no matter which basis you’ll end up measuring your particle in, not known at the time of state preparation, - is what’s salient about the simple 2-particle setup.
The fact is surprising when coupled with the fact that particles do not have a definite spin direction before you measure it. The anti-correlation is maintained non-locally, but the directions are decided by the experiment.
A better example is: take two spheres, send them far away, then make one sphere spin in any orientation that you want. How much would you be surprised to learn that the other sphere spins with the same axis in the opposite directions?
This is the correct answer to the question. Bell and CHSH and all are remarkable but more complicated setups. This—entanglement no matter which basis you’ll end up measuring your particle in, not known at the time of state preparation, - is what’s salient about the simple 2-particle setup.