"One of us in each world" is shorthand for "one of us in the entire system described by the wave function, with different amplitudes in different states". Ther

"One of us in each world" is shorthand for "one of us in the entire system described by the wave function, with different amplitudes in different states". There is only 1 detector, and it, along with the detected particle, is in a superposition of states. Again, this is where the language of "worlds" becomes misleading, and why I don't like it.