The measurement problem is not a case of the quantum formulas getting anything wrong. The Born rule, probability as amplitude squared, is tested to extraordinary precision; electrons fired one at a time through two slits still build up interference fringes, and merely having which-path information makes the fringes vanish. What has no accepted answer is why a superposition settles on exactly one outcome when measured. Copenhagen, many-worlds, Bohm's pilot wave and decoherence tell four different stories over the same mathematics, and no experiment yet separates most of them.
The measurement problem is not a case of the quantum formulas getting anything wrong. The Born rule, probability as amplitude squared, is tested to extraordinary precision; electrons fired one at a time through two slits still build up interference fringes, and merely having which-path information makes the fringes vanish. What has no accepted answer is why a superposition settles on exactly one outcome when measured. Copenhagen, many-worlds, Bohm's pilot wave and decoherence tell four different stories over the same mathematics, and no experiment yet separates most of them.
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