What experiments could verify the existence of gravitons?

Whenever you're taking about "verifying" something in physics, you have to be really careful what you mean. Ultimately, you're verifying predictions of a theory. read more

Now you can come up with Gedanken experiments where you can easily infer the existence of the graviton. However, these experiments are far outside of any technology we're capable of making. Likely beyond the technology possibly for even hypothetical advanced aliens. read more

Krauss and Wilczek suggest that the existence of gravitons, and the quantum nature of gravity, could be proved through some yet-to-be-detected feature of the early universe. "This may provide, if Freeman Dyson is correct about the fact that terrestrial detectors cannot detect gravitons, the only direct empirical verification of the existence of gravitons," Krauss said. read more

An experimental realization of his scheme could, he argues, offer a way to test quantum gravity theories and search for gravitons (the hypothetical quantum particles that mediate gravity). Based on what I know, quantum gravitons are only in the linearized theory and perturbative Quantum Gravity. read more