Einstein's theory of gravity admits a low energy effective quantum field description from which predictions beyond classical general relativity can be made. As gravitational wave detectors improve, we may ask whether nonclassical features of such theory can be experimentally verified? In this talk, I will discuss three aspects of this question: First, what kinds of signals would nonclassical GWs impart on a detector? Next, what would we need to measure in order to certify the quantum nature of gravity? And finally, are nonclassical gravitational wave states produced in Nature, and if yes, what are the sources?

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