Original Post

1. Entanglement is easy: interactions form irreducible multi-component emergent scale structure. The information about which must exist somewhere, after all.
2. Pure state is the simplest one, the one you get after wavefunction collapse. The one you see and measure.
3. Mixed state is just our confusion, when we simply don't know what exact state system has.
4. Superposition is hard. It does require multiverse of some sort to comprehend. This is where all quantum weirdness comes. This is where interference of counterfactual mutually exclusive states is possible.

What are nonlocal correlations, mutual information, teleportation, relatively to these concepts?