Loading Events

« All Events

  • This event has passed.

Quantum field theory approach to quantum information

September 28, 2023 @ 4:00 pm - 6:00 pm

Quantum Matter Seminar

Speaker: Cenke Xu (UCSB)

Title: Quantum field theory approach to quantum information

Abstract: We apply the formalism of quantum field theory and Euclidean space-time path integral to investigate a class of quantum information problems. In particular, we investigate quantum many-body systems under weak-measurement and decoherence. The Euclidean space-time path integral allows us to map this problem to a quantum field theory with (temporal) boundary or defects. We therefore investigate two types of quantum many-body systems with nontrivial boundary physics: quantum critical points, and states with nontrivial topology, such as Chern insulator and symmetry protected topological states. For example, we demonstrate that a Wilson-Fisher quantum critical point can be driven into an “extraordinary-log” phase after weak-measurement. Another example is that, we argue that a system with higher form symmetry may be driven to a self-dual phase transition under weak measurement.


September 28, 2023
4:00 pm - 6:00 pm
Event Category:


Juven Wang


CMSA Room G10
CMSA, 20 Garden Street
Cambridge, MA 02138 United States
+ Google Map