Speaker:  Yuan-Ming Lu (Ohio State University)

Date & Time: 10am, Feb 27, 2025

Place: Seminar Room A&D, 3F, Engineering Building 6

Title: Bilayer construction of phases and phase transitions in open quantum systems

Abstract: We introduce the bilayer construction, a canonical purification scheme for a generic mixed state, to study quantum phases and phase transitions in open quantum systems. Different from the Choi-Jamiołkowski isomorphism, any mixed state can be realized as the monolayer reduced density matrix of a bilayer pure state, and its physical properties can be experimentally realized and detected in bilayer 2D materials with a layer-exchange mirror symmetry. In this talk we discuss three aspects of mixed states in the bilayer construction: (1) phase transitions that spontaneously break strong and/or weak symmetries in mixed states, (2) symmetry protected mixed states that have no counterparts in pure states, (3) classification of short-range-correlated mixed states in two dimensions.

Reference:

https://arxiv.org/abs/2411.07174