They don’t spread much faster compared to “winning” branches I guess
They don’t spread faster, they spread wider. Their low amplitude information is smeared over an environmental already containing a lot of other low amplitude information, noise in effect. So the chances of recovering it are zero for all practical purposes.
With a remark that “decoherent branching” and “coherent branching” are presumably just one process differing in how much the information is contained or spreads out
Well, no. In a typical measurement, a single particle interacts with an apparatus containing trillions, and that brings about decoherence very quickly, so quickly it can appear like collapse. Decoherent branches, being macroscopic , stable and irreversible, for all practical purposes, are the opposite to coherent ones.
They don’t spread faster, they spread wider. Their low amplitude information is smeared over an environmental already containing a lot of other low amplitude information, noise in effect. So the chances of recovering it are zero for all practical purposes.
Well, no. In a typical measurement, a single particle interacts with an apparatus containing trillions, and that brings about decoherence very quickly, so quickly it can appear like collapse. Decoherent branches, being macroscopic , stable and irreversible, for all practical purposes, are the opposite to coherent ones.