Last week, I wrote a big long post about why entanglement doesn’t allow faster-than-light communication, and included a passing mention that was related somehow to the “Many-Worlds” Interpretation of quantum physics. That post was long already, so I didn’t have room to say more, but that remark probably deserves unpacking.
Now, entanglement as a general phenomenon is kind of mysterious, so saying that it can help you understand another totally mysterious quantum idea might seem less than perfectly helpful. the nice thing about entanglement, though, is that even if you don’t think about the underlying mechanism at all, it provides a very concrete set of results, verified in countless experiments, that we can use to ground our thinking about deeper issues.