【大学频道】北京大学量子材料科学中心呈献 | 北京大学张亿博士

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题目：Machine Learning for Quantum Materials and Algorithms

报告人：张亿

单位：北京大学

时间：2019-09-25

地点：北京大学

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报告摘要

Today, we face major scientific challenges because the large-scale data acquired by our automated scientific instrumentation and algorithm and the vast degrees of freedom of our target subjects are constantly defying human analysis. Here we sketch concepts, strengths as well as shortcomings of machine learning techniques, and how they may serve as useful tools in overcoming data largeness and noises as well as bridging fields such as between computation and theory, experiment and theory, and even inter-discipline. We report developments in machine learning approaches in recognizing different types of topological phases from quantum many-body states and validating hypothesized order hidden through complex, experimentally-derived electronic quantum matter images at the atomic scale. In particular, we bridge quantum states and classical machine learning techniques coherently with an ensemble of chosen operators we dub as quantum loop topography. We also repeatedly discover a very specific, lattice-commensurate, unidirectional, and translational-symmetry-breaking state favoring particle-like strong-coupling theories of electronic liquid crystals from a large, experimentally-derived electronic quantum matter image archive spanning a wide range of electron densities and energies in carrier-doped cuprates. As a pedagogical example, we outline our progress in using machine learning for efficient and generic quantum computation realizations of quantum adiabatic algorithm and topological quasiparticle braiding.

个人简介

Dr. Zhang, Yi is a theorist in condensed matter physics, focusing on emergent phenomena and novel approaches in quantum materials and systems. He obtained his Ph.D. degree at UC Berkeley. Then he moved to Stanford University as a SITP postdoctoral fellow and later to Cornell University as a Bethe fellow. In 2019, he joined the faculty of International Center for Quantum Materials and the School of Physics at Peking University. Yi Zhang is interested in various quantum algorithm applications including machine learning and quantum entanglement in quantum systems, theoretical characterizations and experimental properties of topological phases and materials, and various other topics. He has published more than 30 papers, including Nature, Nature Physics, PRL, Nature communications, Nano Lett. and others, with citation of over 2000 times.