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

作者：Guo-Xian Su, Hui Sun, Ana Hudomal, Jean-Yves Desaules, Zhaoyu Zhou, Bing Yang, Jad C. Halimeh, Zhen-Sheng Yuan, Zlatko Papić, Jian-Wei Pan · 发表于：Physical Review Research · 年份：2023 · DOI：10.1103/physrevresearch.5.023010 · 被引用次数：172 · 研究领域：Quantum many-body systems、Cold Atom Physics and Bose-Einstein Condensates、Quantum, superfluid, helium dynamics

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 ${\mathbb{Z}}_{2}$ 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.