Otters: An Energy-Efficient Spiking Transformer via Optical Time-to-First-Spike Encoding - Yan, Zhanglu; Mao, Jiayi; Liu, Qianhui; Li, Fanfan; Luo, Tao; Pan, Gang; Zhu, Bowen; Wong, Weng-Fai (International Conference on Learning Representations, 2026)