GQFI-UGent-WST Seminar: Tatsuma Nishioka "Topological pseudo entropy"
Recently, a new quantum information measure called pseudo entropy was introduced as a generalization of entanglement entropy to quantify quantum correlation between initial and final states in a time-dependent system. In this talk, Tatsuma Nishioka (Yukawa Institute for Theoretical Physics) examines some aspects of pseudo entropy in topological field theory and conformal field theory (CFT). In three-dimensional Chern-Simons theory, pseudo entropy can be given by a partition function on a three-sphere with Wilson loops in a similar manner to topological entanglement entropy. Tatsuma also shows that the pseudo entropy in a certain setup is equivalent to the interface entropy in two-dimensional CFTs, and leverages the equivalence to calculate the pseudo entropies in particular examples. Furthermore, he defines a pseudo entropy extension of the left-right entanglement entropy in two-dimensional boundary CFTs and derives a universal formula for a pair of arbitrary boundary states.
The Virtual Seminar Series “GQFI-Ghent University-Warsaw String Theory” (GQFI-UGent-WST) is a joint initiative between the strings/holography groups at the Albert Einstein Institute (AEI) in Potsdam, Ghent University and the University Warsaw. The calendar for upcoming GQFI-UGent-WST seminars can be found here: https://gqfi.aei.mpg.de/node/3.
This talk is primarily based on arXiv:2107.01797 [hep-th] (https://arxiv.org/abs/2107.01797).
This talk was recorded on November 2nd, 2021 at the Albert Einstein Institute in Potsdam-Golm.