You are right, (apparent) collapse is not reversible, and there is no known way to figure out the pre-collapsed quantum state, and so there is no state to apply the Born rule to. This statement makes sense when discussing the evolution of quantum systems, not classical systems though.
You are right, (apparent) collapse is not reversible, and there is no known way to figure out the pre-collapsed quantum state, and so there is no state to apply the Born rule to. This statement makes sense when discussing the evolution of quantum systems, not classical systems though.