Giant Atoms Solve an Unsolvable Quantum Puzzle ⚡ экспресс
Imagine you need to arrange magnets so they repel each other as much as possible — that's similar to the problem scientists are solving. Using a quantum 'soup' of cold atoms and classical calculations, they managed to find a more efficient solution. What if this approach could one day help create superfast computers?
A network of tiny magnets seeks the state with the lowest total energy—that's roughly what the quantum Max Cut problem looks like, one of the toughest in physics. Scientists have been hunting for its solution since the days of Werner Heisenberg. A new approach harnesses Rydberg atoms: here an electron is so far from the nucleus that the atom balloons to a size comparable to the thickness of a human hair, behaving like a giant hydrogen atom. Such atoms are studied by spectroscopy.
The system of these atoms is slowly “annealed”—like cooling metal, it naturally settles into an almost perfect arrangement of magnets. The remaining disorder, or entropy, is cleaned up by a classical optimizer algorithm. The hybrid method achieved a record accuracy of 0.651. And even if the quantum part makes mistakes, the final result still beats purely classical solutions.
These very same giant atoms are so sensitive that they can detect individual particles of light, turning into ultrasensitive detectors.
🎯 Rydberg atoms are so sensitive that they can capture single photons, working as ultrasensitive light detectors.