报告题目：Characterizing Quantum Many-body Dynamics with Projected Ensembles
报 告 人：葛自勇博士（日本理化学研究所 博士后）
报告时间：2025年4月23日（星期叁）下午3:30
报告地点：物理楼（18号楼）二楼213室学术报告厅
报告摘要：
Traditional studies of quantum many-body physics often rely on observables and entanglement derived from density matrices. Recently, projected ensembles have been introduced as a powerful framework, capturing deeper aspects of quantum thermalization and entanglement. In this talk, I will first present our experimental investigation of chaotic many-body dynamics on a superconducting processor using projected ensembles. We observe Haar-distributed steady states, providing direct evidence of deep thermalization. By defining an ensemble-averaged entropy, we also establish a benchmark for many-body information leakage. Then, I will introduce bipartite projected ensembles to characterize entanglement phases. The ensemble-averaged entanglement can serve as a correlation function, revealing phase transitions and their critical properties, including scaling behavior and surface exponents in monitored random circuits.
报告人介绍：
葛自勇博士于2016年获得华中科技大学学士学位，2021年获得中科院物理所博士学位，2021年10月至今就职于日本理化学研究所，为博士后研究员，合作导师为 Franco Nori 教授。目前主要从事量子多体物理和量子模拟理论研究，已发表学术论文17篇，其中包括：Physical Review Letters 3篇， npj Quantum Information 1篇，Nature Communications 1篇，以及Physical Review A/B/Research若干。