| Time：1121128 (Tue.) 12:00~14:00 Speaker：黃聖傑(Sheng-Jie Huang) Postdocs + Long-Term Guest Scientists,, Max Planck Institute for the Physics of Complex Systems(MPIPKS), Dresden, Germany Title：Generalized symmetry in topological phases and quantum error-correcting codes Abstract：Topological phases of matter can host a broad class of non-trivial topological defects with varying codimensions. These defects include well-known examples such as point charges and flux loops. The complete algebraic structure of these topological defects defines a higher category, and can be viewed as an emergent higher symmetry. This plays a crucial role both in the classification of phases of matter and the possible fault-tolerant logical operations in topological quantum error correcting codes. In this talk, I will discuss some recent progress in our understanding of the properties of generalized symmetry, topological defects, and their connection to logical operators in (2+1) and (3+1) dimensions. The emphasis will be on invertible defects and higher group symmetry, with discussions centered around various lattice model examples. Place：F104, Gongguan Campus, NTNU |
