1:30 pm MCP 201
The Symmetry Taco: Equivalences between gapped, gapless, and mixed state SPTs.
The symmetry topological field theory (SymTFT) offers a unifying framework fordescribing quantum phases of matter and transitions between them. In this talk, we discuss a natural extension of the SymTFT framework to mixed-state phases by introducing the Symmetry Taco: a bilayer topological order in 2+1d whose folded geometry naturally captures both the strong and weak symmetries of the 1+1d mixed state phase. Using this perspective, we find natural correspondences between certain gapped, gapless, and mixed state SPTs in one dimension. Wealso identify a new "anomaly" unique to mixed states arising from gauging a weak symmetry.