[Retric]

As I understand it 'Spooky action at a distance' does not allow communication, but in for hidden variable theory to work a particle needs access to another particles hidden variables. Unless you want to suggest another model?

[kgwgk]

Why is non-locality a problem for hidden variables theories and not for the "standard" interpretation of quantum mechanics?

[Retric]

Quantom mechanics is based on non-locality, that's one of the things people have problems with.

Quantum key distribution for example is seems to be based on this https://en.wikipedia.org/wiki/Quantum_key_distribution.

As to the truth well ¯\_(ツ)_/¯

[kgwgk]

I thought you said that the hidden-variables extension of quantum mechanics is "bad" (compared to the "vanilla" QM) because you need to allow information to travel faster than light speed.

But I agree if you meant that QM (both non-local hidden-variables and standard interpretation) requires non-locality, unlike local hidden-variables theories which are ruled out by the violation of Bell inequalities which has been established experimentally.

[Retric]

Hidden variables where specificly proposed as a solution to non-locality. So, I just mean bad in that they did not solve that problem.

[kgwgk]

True. However, unlike the "standard" QM interpretation, the non-local hidden-variables theories are deterministic (which is the reason why they were mentioned in this thread a few messages back).