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We study the quantum thermalization and information scrambling dynamics of anexperimentally realizable quantum spin model with homogeneous XX-typeall-to-all interactions and random local potentials. We identify thethermalization-localization transition by changing the disorder strength, undera proper all-to-all interaction strength. The scrambling dynamics in thelocalization phase shows novel behaviors distinct from that of local models.The operator scrambling grows almost equally fast in both phases. In thethermal phase, we show there exhibits fast scrambling without appealing to thesemi-classical limit. We also briefly discuss the experimental realization ofthe model using superconducting qubit quantum simulators.

Fast scrambling dynamics and many-body localization transition in an all-to-all disordered quantum spin model