报告题目：Probing Entanglement ScalingAcross a Quantum Phase Transition on a Quantum Computer
报 告 人：苗强 （Duke University）
时间地点：2025-11-27 10：00 腾讯会议：417-634-2429（Meeting Password: 745120）
内容摘要：The investigation of strongly-correlated quantum matter is difficult due to the curse of dimensionality and intricate entanglement structures. These challenges are particularly pronounced in the vicinity of continuous quantum phase transitions, where quantum fluctu-ations manifest across all length scales. While quantum simulators give controlled access to a number of strongly correlated systems, the study of critical phenomena has been hampered by finite-size effects arising from diverging correlation lengths. Moreover, the experimental investigation of entanglement in many-body systems has been hindered by limitations in measurement protocols. To address these challenges, we employ the multi-scale entanglement renormalization ansatz (MERA) and implement a holographic scheme for subsystem tomography on a fully-connected trapped-ion quantum computer. Our method accurately represents infinite systems and long-range correlations with few qubits,facilitating the efficient extraction of observables and entanglement properties, even at criticality. We observe a quantum phase transition with spontaneous symmetry breaking and reveal the evolution of entanglement properties across the critical point. For the first time, we demonstrate log-law scaling of subsystem entanglement entropies at criticality on a digital quantum computer. This achievement highlights the potential of MERA for the investigation of strongly-correlated many-body systems on quantum computers.
报告人简介：Qiang Miao is a Postdoctoral Associate at Duke Quantum Center, Duke University. His research explores quantum matter using both quantum platforms and classical computa-tional methods, developing algorithms that bridge quantum and classical approaches to complex many-body systems. He received his Ph.D. in theoretical condensed-matter physics from Duke University in 2022.
