  We report on an experimental simulation of the spin-1 Heisenberg model with
composite bosons in a one-dimensional chain based on the two-component
Bose-Hubbard model. Exploiting our site-and spin-resolved quantum gas
microscope, we observed faster superexchange dynamics of the spin-1 system
compared to its spin-1/2 counterpart, which is attributed to the enhancement
effect of multi-bosons. We further probed the non-equilibrium spin dynamics
driven by the superexchange and single-ion anisotropy terms, unveiling the
linear expansion of the spin-spin correlations, which is limited by the
Lieb-Robinson bound. Based on the superexchange process, we prepared and
verified the entangled qutrits pairs with these composite spin-1 bosons,
potentially being applied in qutrit-based quantum information processing.
