How does the quantum description of reality, which includeselements such as the superposition of states and wavefunctioncollapse or quantum decoherence, give rise to the reality weperceive? Another way of stating this question regards themeasurement problem: What constitutes a \"measurement\" whichapparently causes the wave function to collapse into a definitestate? Unlike classical physical processes, some quantum mechanicalprocesses (such as quantum teleportation arising from quantumentanglement) cannot be simultaneously \"local\", \"causal\", and\"real\", but it is not obvious which of these properties must besacrificed, or if an attempt to describe quantum mechanicalprocesses in these senses is a category error such that a properunderstanding of quantum mechanics would render the questionmeaningless. Can a multiverse resolve it?
