Wolfram Physics Q&A

The simplest variant of the (Everettian) many-worlds interpretation of quantum mechanics, in which there is no effective interference between distinct branches of history, may be thought of as corresponding to the special case of multiway evolution in which there is no resolution of branch pairs (i.e. there is only branch pair divergence), and in which the observer follows only a single multiway branch. The full version of our model, with branch pair convergence and measurement-imposed completion procedures (as detailed in the question on interference), may therefore be thought of as corresponding to a version of Deutsch’s variant of the many-worlds interpretation, in which branches of history are permitted to interfere.