Interplay between disorder and topology in Thouless pumping on a superconducting quantum processor

• URL: http://arxiv.org/abs/2401.01530v2
• Date: Thu, 22 May 2025 06:22:13 GMT
• Title: Interplay between disorder and topology in Thouless pumping on a superconducting quantum processor
• Authors: Yu Liu, Yu-Ran Zhang, Yun-Hao Shi, Tao Liu, Congwei Lu, Yong-Yi Wang, Hao Li, Tian-Ming Li, Cheng-Lin Deng, Si-Yun Zhou, Tong Liu, Jia-Chi Zhang, Gui-Han Liang, Zheng-Yang Mei, Wei-Guo Ma, Hao-Tian Liu, Zheng-He Liu, Chi-Tong Chen, Kaixuan Huang, Xiaohui Song, SP Zhao, Ye Tian, Zhongcheng Xiang, Dongning Zheng, Franco Nori, Kai Xu, Heng Fan,
• Abstract summary: Topological phases are robust against weak perturbations, but break down when disorder becomes sufficiently strong.<n>Here, we report experimental observations of the competition and interplay between Thouless pumping and disorder on a 41-qubit superconducting quantum processor.<n>We demonstrate Thouless pumping in the presence of disorder and show its breakdown as the strength of disorder increases.<n>In particular, an intrinsic topological pump that is induced by quasi-periodic hopping disorder has never been experimentally realized before.
• Score: 22.210981663514247
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Topological phases are robust against weak perturbations, but break down when disorder becomes sufficiently strong. However, moderate disorder can also induce topologically nontrivial phases. Thouless pumping, as a (1+1)D counterpart of the integer quantum Hall effect, is one of the simplest manifestations of topology. Here, we report experimental observations of the competition and interplay between Thouless pumping and disorder on a 41-qubit superconducting quantum processor. We improve a Floquet engineering technique to realize cycles of adiabatic pumping by simultaneously varying the on-site potentials and the hopping couplings. We demonstrate Thouless pumping in the presence of disorder and show its breakdown as the strength of disorder increases. Moreover, we observe two types of topological pumping that are induced by on-site potential disorder and hopping disorder, respectively. In particular, an intrinsic topological pump that is induced by quasi-periodic hopping disorder has never been experimentally realized before. Our highly controllable system provides a valuable quantum simulating platform for studying various aspects of topological physics in the presence of disorder.

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