## Can We Test Gravitational Waves For Wave-Particle Duality?

“Although we have every reason to believe that gravitational waves are simply the quantum analog of electromagnetic waves, we have, unlike the electromagnetic photon, not yet risen to the technological challenges of directly detecting the gravitational particle that’s the counterpart of gravitational waves: the graviton.

Theorists are still calculating the uniquely quantum effects that should arise and are working together with experimentalists to design tabletop tests of quantum gravity, all while gravitational wave astronomers puzzle over how a future-generation detector might some day reveal the quantum nature of these waves. Although we expect gravitational waves to exhibit wave-particle duality, until we detect it, we cannot know for certain. Here’s hoping that our curiosity compels us to invest in it, that nature cooperates, and that we find out the answer once and for all!”

One of the revolutionary discoveries of the quantum world was that every particle that we know of also behaves as a wave. Photons are the quanta associated with light, and every light wave is made up of a discrete number of photons. Particles like electrons also can behave as waves; if you send them through a double slit, even one-at-a-time, they’ll produce an interference pattern.