Quote from: alancalverd
Pedant mode: Heisenberg described the inherent indeterminacy of a phenomenon, not the uncertainty of its measurement.It is possible to weight the odds in Heisenberg indeterminacy, by using squeezed quantum states. You reduce the uncertainty in one dimension (which you care about), and accept that it will be less certain in another dimension (that you don't care so much about).
- So if you were measuring a distance accurately (eg the length of the standard meter, or the length of a gravitational wave detector), you may care more about uncertainty in distance than you care about uncertainty in photon momentum.
- Both LIGO and VIRGO use squeezed quantum states to improve sensitivity in detection of gravitational wave events.
- They both use real reflected photons to make the measurement