学术报告：PT-symmetric non-unitary quantum walks
报告人：Hideaki Obyse 教授（Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan）
Abstract: We study Floquet topological phases driven by PT symmetric nonunitary time evolution in one dimension, based on an experimental setup of discrete-time quantum walks. We develop, for nonunitary time-evolution operators, a procedure to calculate topological invariants for Floquet topological phases and nd that the bulk-edge correspondence gives correct predictions of the emergent edge states. These edge states make exponential growth of wavefunction amplitudes at speci c positions with
time controllable. Hereby, we propose that these phenomena inherent in open quantum systems are feasibly observed by present experiments of quantum walks in both classical and quantum regimes.