报告题目
Experimental Probing Topological Order and Its Breakdown via Modular Matrices
报告时间
研究方向
拓扑物态、量子信息与计算、量子引力等领域的交叉研究
专家简介
万义顿:男,复旦大学物理系教授,华南理工大学计算机与经济学双学士(1998)、美国宾夕法尼亚大学计算机硕士(2002)、加拿大渥太华大学物理硕士(2004)、加拿大滑铁卢大学暨圆周理论物理研究所理论物理博士(2009),于日本近畿大学、东京大学、加拿大圆周理论物理研究所做博士后,2016年加入复旦物理系,从事拓扑物态、量子信息与计算、量子引力等领域的交叉研究。
报告摘要
I will talk about our recent works on quantum simulation of quantum systems beyond direct experiments, with a focus on simulating topological order and its breakdown via modular matrices. The modern conception of phases of matter has undergone tremendous developments since the first observation of topologically ordered states in fractional quantum Hall systems in the 1980s. In this talk, I shall explore the question: How much detail of the physics of topological orders can in principle be observed using state of the art technologies? We find that using surprisingly little data, namely the toric code Hamiltonian in the presence of generic disorders and detuning from its exactly solvable point, the modular matrices -- characterizing anyonic statistics that are some of the most fundamental finger prints of topological orders -- can be reconstructed with very good accuracy solely by experimental means. This is a first experimental realization of these fundamental signatures of a topological order, a test of their robustness against perturbations, and a proof of principle -- that current technologies have attained the precision to identify phases of matter and, as such, probe an extended region of phase space around the soluble point before its breakdown. Given the special role of anyonic statistics in quantum computation, our work promises myriad applications both in probing and realistically harnessing these exotic phases of matter.