Topology and Entanglement in Quantum Matter

Contribution List

3. Shinsei Ryu (Princeton University)

07/04/2026, 09:00

2. Fractional quantum anomalous Hall effects in rhombohedral pentalayer graphene

Prof. Xiao Li

07/04/2026, 10:05

The fractional quantum anomalous Hall (FQAH) effect in rhombohedral pentalayer graphene (PLG) has attracted significant attention due to its potential for observing exotic quantum states [1-3]. This talk will discuss two projects exploring the FQAH effect in PLG. First, we present a self-consistent Hartree-Fock theory focusing on the convergence of the calculation with various reference fields...

6. Non-Hermitian quantum systems and non-unitary criticality

Po-Yao Chang

07/04/2026, 11:25

The characterization of non-unitary conformal field theories (CFTs) via entanglement measures is often hindered by the appearance of negative central charges, which lack a clear interpretation in standard entanglement theory. We address this by formulating a generalized entanglement entropy that remains well-defined in the non-unitary regime. Through numerical and analytical...

5. Dualities and Exact Many-Body Scars

Prof. Masahito Yamazaki (University of Tokyo)

07/04/2026, 14:00

I will first discuss new examples of quantum many-body scars in the two-dimensional XY model. I will then discuss a dual $Z_2$ gauge theory obtained by gauging a global symmetry of the XY model, and discuss corresponding scars therein. This discussion suggests the possibility of systematic exploration of quantum many-body scars in the web of theories related by dualities. The talk is based on...

4. Interference, topology, and new Hilbert-space routes to quantum non-ergodicity

Yi-Ping Huang (National Tsing Hua University)

07/04/2026, 15:20

A central challenge in nonequilibrium quantum physics is to understand why certain many-body systems fail to thermalize even in the absence of disorder or integrability. In this talk, I will outline a different perspective in which non-ergodicity is governed by hidden geometric structures in Hilbert space rather than by conventional real-space mechanisms. This viewpoint leads to the concept of...

1. Quantum speed limits and selected applications in quantum many-body physics and quantum information science

Prof. Jyong-Hao Chen (National Central University)

07/04/2026, 16:10

Quantum speed limits furnish fundamental bounds on the rate of quantum evolution and thus provide a natural framework for analyzing quantum state preparation. In this talk, I will review the geometric formulation of quantum speed limits and discuss how these bounds can be used to constrain fidelities in driven many-body systems. I will focus in particular on applications to adiabatic dynamics,...