时间：7月20日（周一） 9:30--11:00

地点：勤园20—518

报告摘要：

Understanding how complex systems transition between order and chaos is a central challenge of nonequilibrium physics. While weak perturbations of classical integrable systems give rise to a mixed phase space of coexisting regular and chaotic trajectories, analogous behavior in interacting quantum many-body systems has remained elusive. Here we develop and experimentally implement a hybrid quantum–classical feedback protocol that autonomously discovers and stabilizes long-lived regular trajectories in a superconducting quantum processor. Each iteration combines short-time quantum evolution with classical optimization that projects the dynamics back onto a low-entanglement variational manifold, effectively distilling coherence from chaotic evolution. The stabilized trajectories reveal a quantum many-body mixed phase space emerging from nonlinear variational dynamics, without a direct analogue in classical or few-body quantum systems. Our results establish a versatile framework for algorithmic discovery and control of coherent dynamics previously inaccessible to experiment.

报告人简介：

任杰博士，英国利兹大学（University of Leeds）的博士后研究员。他于2024年在中国科学院物理研究所获得博士学位。他的研究聚焦于非平衡量子多体动力学，重点关注量子多体疤痕（quantum many-body scars）、受监控/开放系统（monitored/open systems）以及低维系统的反常输运性质。