This is a really great experiment. It's nice to see real work being done on the ground with these kinds of tests and write-ups. I am not a physicist but I imagine this could have implications for gravitational wave detection by improving LIGO's optical sensors, maybe optical sensors in general?
Or maybe this could help with tracking time more accurately? Hopefully someone with knowledge can chime in with what this means in practice.
I don't believe the LIGO experiment is utilizing entangled photons. This experiment is using a very different type of interferometer because they're trying to be sensitive to rotations, whereas LIGO's interferometer is for measuring changes in length. LIGO's biggest problem is how to minimize losses in their mirrors.
LIGO could potentially utilise EPR entanglement between photons in different parts of the detector but it does not do so yet. That’s a potential future development. It does use quantum squeezing though
Or maybe this could help with tracking time more accurately? Hopefully someone with knowledge can chime in with what this means in practice.