  As the basis for generating multi-particle quantum correlations,
inter-particle interaction plays a crucial role in collective quantum
phenomena, quantum phase transitions, and quantum information processing. It
can profoundly alter the band structure of quantum many-body systems and give
rise to exotic topological phenomena. Conventional topological pumping, which
has been well demonstrated in driven linear or noninteracting systems, may
break down in the presence of strong interaction. However, the interplay
between band topology and interaction could also induce emergent topological
pumping of interacting particles, but its experimental realization has proven
challenging. Here we demonstrate interaction-induced topological pumping in a
solid-state quantum system comprising an array of 36 superconducting qubits.
With strong interaction inherent in the qubits and site-resolved
controllability of the lattice potential and hopping strength, we realize the
topological Thouless pumping of single and two bounded particles. Beyond these
topological phenomena with linear or noninteracting counterparts, we also
observe topologically resonant tunneling and asymmetric edge-state transport of
interacting particles. Our work creates a paradigm for multi-particle
topological effects, and provides a new pathway to the study of exotic
topological phenomena, many-body quantum transport, and quantum information
transfer.
