Xiao Li

By combining lithium niobate and gallium arsenide, scientists created a chip. In it, quantum dots interact with microresonator modes, and electro-optic tuning of the feedback phase drives the system to an exceptional point. At this singularity, two modes coalesce, and the spectral density of states

The idea that all objects fall equally underpins Einstein's theory. On the Chinese space station, physicists compared the fall of two types of rubidium atoms. The result matched the prediction with an error of a few ten-millionths.