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The origin of dark matter is a driving question of modern physics. Low-energyantideuterons provide a "smoking gun" signature of dark matter annihilation ordecay, essentially free of astrophysical background. Low-energy antiprotons area vital partner for this analysis, and low-energy antihelium could providefurther discovery space for new physics. In the coming decade, AMS-02 willcontinue accumulating the large statistics and systematic understandingnecessary for it to probe rare antinuclei signatures, and GAPS, which is thefirst experiment optimized specifically for low-energy cosmic antinuclei, willbegin several Antarctic balloon campaigns. The connection of cosmic-rayantinuclei and dark matter is reviewed and the outlook in light of experimentalprogress is presented.

Astro 2020 Science White Paper: Cosmic-ray Antinuclei as Messengers for Dark Matter