Observation of many-body scarring in a Bose-Hubbard quantum simulator

• Published in: Physical review research Vol. 5; no. 2; p. 023010
• Main Authors: Su, Guo-Xian, Sun, Hui, Hudomal, Ana, Desaules, Jean-Yves, Zhou, Zhao-Yu, Yang, Bing, Halimeh, Jad C., Yuan, Zhen-Sheng, Papić, Zlatko, Pan, Jian-Wei
• Format: Journal Article
• Language: English
• Published: American Physical Society 01-04-2023
• ISSN: 2643-1564; 2643-1564
• DOI: 10.1103/PhysRevResearch.5.023010

The ongoing quest for understanding nonequilibrium dynamics of complex quantum systems underpins the foundation of statistical physics as well as the development of quantum technology. Quantum many-body scarring has recently opened a window into novel mechanisms for delaying the onset of thermalization by preparing the system in special initial states, such as the Z_{2} state in a Rydberg atom system. Here we realize many-body scarring in a Bose-Hubbard quantum simulator from previously unknown initial conditions such as the unit-filling state. We develop a quantum-interference protocol for measuring the entanglement entropy and demonstrate that scarring traps the many-body system in a low-entropy subspace. Our work makes the resource of scarring accessible to a broad class of ultracold-atom experiments, and it allows one to explore the relation of scarring to constrained dynamics in lattice gauge theories, Hilbert space fragmentation, and disorder-free localization.