  The origin of dark matter is a driving question of modern physics. Low-energy
antideuterons provide a "smoking gun" signature of dark matter annihilation or
decay, essentially free of astrophysical background. Low-energy antiprotons are
a vital partner for this analysis, and low-energy antihelium could provide
further discovery space for new physics. In the coming decade, AMS-02 will
continue accumulating the large statistics and systematic understanding
necessary for it to probe rare antinuclei signatures, and GAPS, which is the
first experiment optimized specifically for low-energy cosmic antinuclei, will
begin several Antarctic balloon campaigns. The connection of cosmic-ray
antinuclei and dark matter is reviewed and the outlook in light of experimental
progress is presented.
