Ultrasensitive Sensing Enabled by Self-Dual Singularities in Parity-Time Symmetry. - Jianhui Wu; Jie Li; Chi Zhang 062; Kaihang Zhang; Liangquan Xu; Xuefeng Xu; Jiaqi Lu; Dinku Hazarika; Weipeng Xuan; Hao Jin; Shurong Dong; Minye Yang; et al. (IEEE Trans. Instrum. Meas., 2025)