Ultrafast Science, a Science Partner Journal is an online-only Open Access journal published in affiliation with Xi’an Institute of Optics and Precision Mechanics (XIOPM) of CAS and distributed by the American Association for the Advancement of Science (AAAS). The journal’s mission is to build a platform for ultrafast scientific research; present new theories, concepts, ideas, technologies and progress in this field; publish the latest research representing the forefront of the discipline and that of international concern; and promote academic exchange and development worldwide. Ultrafast Science publishes high-quality original research articles, comprehensive reviews, editorials, and perspectives which feature high novelty, significance and technical quality in cutting-edge and emerging topics in ultrafast science with broad interest from scientific communities. Learn more at: https://spj.sciencemag.org/journals/ultrafastscience