Department of Physics, Tsinghua University

Abstract:
Topological materials provide a protection from decoherence at the hardware level by using emergent non-Abelian anyons. The simplest non-Abelian anyon involves a defect that binds a Majorana zero-energy mode, predicted to appear quite naturally in certain superconducting systems. I will review recent progress in the Majorana search, and the challenges in the validation of Majorana devices. Later I will introduce a simple measurement scheme to overcome the problem, and show robust, clear, and universal experimental signatures of Majorana zero modes. I will also discuss a serious type of errors in general topological quantum computation and Majorana qubit. Diabatic corrections only vanish as a power-law function with the length of time for the braid. This power-law behavior can wash out the advantages of topological quantum computation. We found that such diabatic errors can be detected and corrected by applying a sequence of parity measurements.

报告人简介：刘东，2005年本科毕业于北京大学，2012年获美国Duke大学博士，2012-2014年在美国密西根州立大学从事博士后研究，2014-2017年在Station Q微软研究院加利福尼亚分部任博士后研究员。2018年加入清华大学物理系任助理教授。研究领域为理论量子物理和凝聚态物理，目前的研究兴趣包括：拓扑量子计算（物理实现和架构）,拓扑量子器件的输运和量子调控，多体相互作用量子系统中的非平衡态。

联系人：李永庆

E-mail: yqli@iphy.ac.cn

Joint Seminar of CAS Center for Excellence in Topological Quantum Computation, UCAS; Kavli Institute of Theoretical Science; Key Laboratory of Nanoscale Physics and Devices, Institute of Physics, CAS