主持人: 姚道新 教授
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【报告摘要】
Tensor network approach is a powerful theoretical and computational tool for studying condensed matter systems. Simulating a two-dimensional quantum system using Projected Entangled-Pair States (PEPS) usually contains two major steps: (1) finding out the PEPS wave function using variational algorithms, and (2) evaluating the expectation values of physical observables using coarse-graining methods. In this talk, I will present a loop optimization scheme which can significantly improve the accuracy in both steps. The key idea is to deform a tensor network into small loops and then optimize tensors on each loop. Our scheme is computationally affordable even for a large bond degree of freedom. We benchmark our method on various models and compare to the results based on simple update.
【个人简介】
杨硕(女),清华大学物理系,助理教授。2006年于南开大学获得学士学位,2010年于中国科学院理论物理研究所获得博士学位,之后在美国马里兰大学、德国马克思普朗克量子光学研究所、加拿大圆周理论物理研究所做博士后研究,2017年9月回清华物理系任助理教授。主要研究兴趣包括强关联量子多体系统的理论与数值模拟,拓扑量子物态,量子物理与量子信息。