There are lots of thought experiments and actual experiments that suggest this view doesn’t work. “PBR” is the one that springs to mind. Some people still support this view, but I’ve never seen any of them straightforwardly state what they think the underly reallity (that the amplitudes are supposed to represent beliefs about) actually is.
There are lots of thought experiments and actual experiments that suggest this view doesn’t work. “PBR” is the one that springs to mind. Some people still support this view, but I’ve never seen any of them straightforwardly state what they think the underly reallity (that the amplitudes are supposed to represent beliefs about) actually is.