3 papers
quant-ph2026
Beyond Wigner: Non-Invertible Symmetries Preserve Probabilities
Thomas Bartsch, Yuhan Gai, Sakura Schafer-Nameki
In recent years, the traditional notion of symmetry in quantum theory was expanded to so-called generalised or categorical symmetries, which, unlike ordinary group symmetries, may…
hep-th2025
Unitary Categorical Symmetries
Thomas Bartsch
Global invertible symmetries act unitarily on local observables or states of a quantum system. In this note, we aim to generalise this statement to non-invertible symmetries by con…
math-ph2025
On Unitary 2-Group Symmetries
Thomas Bartsch
Global internal symmetries act unitarily on local observables or states of a quantum system. In this note, we aim to generalise this statement to extended observables by considerin…