Instability of steady-state mixed-state symmetry-protected topological order to strong-to-weak spontaneous symmetry breaking. - Jeet Shah; Christopher Fechisin; Yu-Xin Wang; Joseph T. Iosue; James D. Watson; Yan-Qi Wang; Brayden Ware; Alexey V. Gorshkov; Cheng-Ju Lin (Quantum, 2025)