Despite the annoying use of the words “spooky” and “weird” (why do people so often use those words when talking about quantum mechanics? why? why? why? why?!), I’d like to point you to a nice New Scientist article about the possible use of quantum entanglement to detect gravitational waves. It is by Zeeya Merali, and you can find it at this link.
Have a look and come back and tell us what you think, and/or ask questions. We’ve experts in both areas as readers who might also comment, and who might respond to others’ thoughts on the matter.