题目：拓扑超导中相位与量子比特的关联动力学研究
报告人： 王志 （中山大学）
报告时间：2020年10月27日14:00
报告地点：龙赛理科楼北楼116
报告人介绍：王志，中山大学副教授。2010年毕业于北京师范大学获得博士学位，2010-2012年在日本物质材料研究机构做博士后，2012年入职中山大学任副教授，2017-2018年在得克萨斯大学奥斯汀分校做访问学者。长期从事超导电性的理论研究，近期的研究兴趣主要在拓扑超导系统，尤其是其中的拓扑量子比特的量子动力学研究。
摘要：Topological Josephson junctions are distinct from conventional ones in that they host Majorana bound states which form a two-level quantum system, the so-called Majorana qubit. This quantum dynamics of this Majorana qubit inevitably interplays with the dynamics of the Josephson phase difference. In order to study this interplay, we construct a so-called quantum resistively shunted junction model, which correctly captures the influence of the Josephson phase on the energies of the Majorana qubit and the feedback from the qubit states to the Josephson energy. Within this model, we study the I-V characteristics and the Josephson radiation of the junction. We demonstrate an intrinsic hysteric I-V curve as well as a unique interrupted emission line in the radiation spectra. Our results are quantitatively in agreement with recent experiments.