LIGO Heisenberg uncertainty
in the LIGO which detected gravitational waves, the uncertainty introduced by quantum mechanics (Heisenberg uncertainty etc.), is reduced by focusing on measuring only one thing, namely the distance one arm is stretched compared to the other, thus cramming all the uncertainty into another thing/ measurement which they are not measuring. what is this irrelevant thing with the high uncertainty (the other side of the Heisenberg coin, if you like, to distance)?? is it momentum?
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