  Topological phases of spin liquids with constrained disorder can host a
kinetics of fractionalized excitations. However, spin-liquid phases with
distinct kinetic regimes have proven difficult to observe experimentally. Here
we present a realization of kagome spin ice in the superconducting qubits of a
quantum annealer, and use it to demonstrate a field-induced kinetic crossover
between spin-liquid phases. Employing fine control over local magnetic fields,
we show evidence of both the Ice-I phase and an unconventional field-induced
Ice-II phase. In the latter, a charge-ordered yet spin-disordered topological
phase, the kinetics proceeds via pair creation and annihilation of strongly
correlated, charge conserving, fractionalized excitations. As these kinetic
regimes have resisted characterization in other artificial spin ice
realizations, our results demonstrate the utility of quantum-driven kinetics in
advancing the study of topological phases of spin liquids.
