Sub-millikelvin-resolved superconducting nanowire single-photon detector operates with sub-pW infrared radiation power. - Chen, Qi; Zhou, Fei; Wei, Chen; Dai, Yue; Gan, Haiyong; Zhang, Labao; Wang, Hao; Yuan, Hang; Li, Haochen; Tan, Jingrou; Feng, Guojin; Tu, Xuecou; et al. (National Science Review, 2025)