Wenwen Zhao

Two vortex rings launched one after the other pass through each other and swap places. This dance, first seen in the 19th century with smoke rings, has now been reproduced on a quantum processor. Vortices are the actors on a quantum stage where time plays the role of an extra dimension.

A guitar string rings longer if you don't touch it too much. A resonator, a device that vibrates at a single frequency like a tuning fork, behaves in much the same way. A team of engineers made such a "tuning fork" from aluminum nitride, smaller than a grain of sand, and made it oscillate 16 billion times per second.