  We investigate the propagation of magnons after ultrashort perturbations of
the exchange interaction in the prototype two-dimensional Heisenberg
antiferromagnet. Using the recently proposed neural quantum states, we predict
highly anisotropic spreading in space constrained by the symmetry of the
perturbation. Interestingly, the propagation speed at the shortest length and
time scale is up to 40% higher than the highest magnon velocity. We argue that
the enhancement stems from extraordinary strong magnon-magnon interactions,
suggesting new avenues for manipulating information transfer on ultrashort
length and time scales.
