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arXiv · 2303.04582

Interaction-induced topological pumping in a solid-state quantum system

Ziyu Tao·Wenhui Huang·Jingjing Niu·Libo Zhang·Yongguan Ke·Xiu Gu·Ling Lin·Jiawei Qiu·Xuandong Sun·Xiaohan Yang·Jiajian Zhang·Jiawei Zhang·Shuxiang Zhao·Yuxuan Zhou·Xiaowei Deng·Changkang Hu·Ling Hu·Jian Li·Yang Liu·Dian Tan·Yuan Xu·Tongxing Yan·Yuanzhen Chen·Chaohong Lee·Youpeng Zhong·Song Liu·Dapeng Yu
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Abstract

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.

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Ziyu Tao, Wenhui Huang, Jingjing Niu, Libo Zhang, Yongguan Ke, Xiu Gu, Ling Lin, Jiawei Qiu, Xuandong Sun, Xiaohan Yang, Jiajian Zhang, Jiawei Zhang, Shuxiang Zhao, Yuxuan Zhou, Xiaowei Deng, Changkang Hu, Ling Hu, Jian Li, Yang Liu, Dian Tan, Yuan Xu, Tongxing Yan, Yuanzhen Chen, Chaohong Lee, Youpeng Zhong, Song Liu, Dapeng Yu. 2023-03-08. Interaction-induced topological pumping in a solid-state quantum system. https://doi.org/10.15302/frontphys.2025.033202

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