Noise and decoherence induced by gravitons

Behind the obvious goal of finding a consistent quantum theory of gravity lingers a question, namely if gravity is ``quantized'' at all. The authors work out in detail a recent proposal to detect quantum noise induced by gravitons in LIGO, and add another example, decoherence of massive particles induced by gravitons. Both concepts would prove the existence of quantum gravity and gravitons, the latter potentially in a tabletop experiment.