Hao Su

A laser pulse lasting one and a half nanoseconds hits a nonlinear crystal, and a stream of squeezed light is born. That is how an experiment on the Jiuzhang 4.0 quantum processor in China begins.

Water in a river, flowing around a stone, changes its course: some streams press against the surface, others detach and swirl downstream. A classical computer calculates such flows by dividing the fluid into millions of tiny parcels and tracking each one.