Question: Let's say we added a single particle X (or, well, multiple) to our otherwise quantum world whose position and momentum we could pin down with arbitrary accuracy. What would happen if we used that particle to measure another particle Y? Normally Y has some fundamental uncertainty around its position and momentum, but would having access to X let us bypass that limit? If not, what would happen to the total uncertainty in the system after the measurement?
(If that would allow us to break the limit, then it would seem like this really is a measurement limitation in some sense, so I'm assuming the answer is that that's not the case, but then I'm wondering what would happen afterward.)
(If that would allow us to break the limit, then it would seem like this really is a measurement limitation in some sense, so I'm assuming the answer is that that's not the case, but then I'm wondering what would happen afterward.)