David T. Stephen

Ordinary wires: electrons jostle, lose energy, and heat up: that's resistance. In superconductors, some electrons pair up in sync, like dancers swirling without collisions. But these pairs hide: you can't see them directly, only infer their presence from flawless coordination.

Modern encryption is unthinkable without truly random numbers. But a standard source can be unreliable or even deliberately corrupted. The solution came from experimenters who built a 98-ion quantum processor: it works like a high-speed filter, turning a 'dirty' signal into one that's crystal-clear and unpredictable.