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Dipolar interactions are ubiquitous in nature and rule the behavior of abroad range of systems spanning from energy transfer in biological systems toquantum magnetism. Here, we study magnetization-conserving dipolar inducedspin-exchange dynamics in dense arrays of fermionic erbium atoms confined in adeep three-dimensional lattice. Harnessing the special atomic properties oferbium, we demonstrate control over the spin dynamics by tuning the dipoleorientation and changing the initial spin state within the large 20 spinhyperfine manifold. Furthermore, we demonstrate the capability to quickly turnon and off the dipolar exchange dynamics via optical control. The experimentalobservations are in excellent quantitative agreement with numericalcalculations based on discrete phase-space methods, which capture entanglementand beyond-mean field effects. Our experiment sets the stage for futureexplorations of rich magnetic behaviors in long-range interacting dipoles,including exotic phases of matter and applications for quantum informationprocessing.

Controlling Dipolar Exchange Interactions in a Dense 3D Array of Large Spin Fermions