【报告题目】：Topological Quantum Simulation in Momentum Lattice
【报 告 人】：谢笛舟副教授，国防科技大学
【报告时间】：2026年5月11日（周一），13:30
【报告地点】：29-414
【报告摘要】:In this report, I will give three topological quantum simulations work based on synthetic lattice.
The first work is the study of the topological properties of extended SSH model - SSH4. We implement the SSH4 model in the momentum space lattice by using ultracold atoms. It is verified by experiments that the model's winding number can be obtained by the higher dimensional extension of the mean chiral displacement. The topological phase transition of the system is given experimentally, and the topological edge states are confirmed by quenching dynamics.
The second work is the study of the topological properties of discrete time quantum walk. The topological quantum walk in discrete time is realized by using the ultracold atom in the momentum space lattice. The topological properties of the system are proved experimentally by measuring the time average chiral displacement and the second order statistical moment. In addition, the interaction induced localization in quantum walk dynamics is also observed experimentally.
The third work is the study of non-hermitian skin effect with ultra cold atom. The non-Hermitian skin effect (NHSE), the accumulation of eigen wavefunctions at boundaries of open systems. Here we report the experimental realization of a dissipative Aharonov-Bohm chain—a non-Hermitian topological model with NHSE—in the momentum space of a two-component Bose-Einstein condensate. We identify unique signatures of NHSE in the condensate dynamics, and perform Bragg spectroscopy to resolve topological edge states against a background of localized bulk states.
参考文献：
[1] Dizhou Xie, Wei Gou, Teng Xiao, Bryce Gadway and Bo Yan, Topological characterizations of an extended Su-Schrieffer-Heeger model. NPJ Quantum Information, 5, 1 (2019).
[2] Dizhou Xie* ,Tian-Shu Deng*, Teng Xiao, Wei Gou, Tao Chen, Wei Yi, and Bo Yan, Topological Quantum Walks in Momentum Space with a Bose-Einstein Condensate. Phys. Rev. Lett. 124, 050502 (2020).
[3] Qian Liang*, Dizhou Xie*, Zhaoli Dong*, Haowei Li, Hang Li, Bryce Gadway, Wei Yi,and Bo Yan，Dynamic Signatures of Non-Hermitian Skin Effect and Topology in Ultracold Atoms.Phys. Rev. Lett. 129, 070401 (2022).
【报告人简介】：谢笛舟，国防科技大学理学院副教授。苏州大学电子信息工程学院本科（2011~2015）、浙江大学物理系硕博连读（2015~2021），2021年获浙江大学光学博士学位。奥地利因斯布鲁克大学博士后（2022~2025）、德国马克思普朗克研究所博士后（2025~2026）、国防科技大学理学院副教授（2026~）。主要致力于基于超冷原子量子模拟的实验研究。原创性工作包括：（1）在超冷原子体系实现了SSH4模型，验证了高维SSH模型的拓扑不变量测量方法；（2）在超冷原子体系实现离散时间量子行走，并且观测到了相互作用导致的局域化；（3）在超冷原子体系观测到了非厄米趋肤效应的动力学行为。
