Atoms chilled to almost nothing just rehearsed one of physics' most elusive events: matter appearing from empty space

A sufficiently strong electric field should, in theory, be able to conjure particles and their antimatter partners out of empty space — an idea called the Schwinger effect, predicted decades ago and never directly observed, because no laboratory field is strong enough. Researchers at the University of Science and Technology of China have built a stand-in: a chain of ultracold rubidium atoms held in a pattern of laser light, arranged so the atoms play the roles of particles and fields, published in Physical Review Letters. By tuning the setup, the team watched simulated particle-antiparticle pairs form and measured how the process fades when the particles are heavier or the field too dominant. It is a rehearsal, not the real event — and rehearsals are how impossible experiments become possible.

Mechanism: tech innovation