"In many cases, it is enough to know the change in position and momentum of the thing we are measuring. Change with respect to what, though? If we measure the change of one oscillator (think swing) with respect to a different oscillator, then the uncertainty principle can be evaded. "

https://arstechnica.com/science/2017/08/negative-mass-swing-beats-the-uncertainty-principle/

Just trying to help you out.  I think they might have this in topical form at Longs.  Your welcome.