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

We study the quantum thermalization and information scrambling dynamics of an experimentally realizable spin model with homogeneous XX-type all-to-all interactions random local potentials. identify thermalization-localization transition by changing disorder strength, under a proper interaction strength. The in localization phase shows behaviors that are distinct from models. operator grows almost equally fast two phases. In thermal phase, we show is exhibited without appealing to semiclassical limit. also briefly discuss experimental realization using superconducting qubit simulators.