Quantum Batteries: Charging Atomic Nuclei with a Laser ✎ express
The atomic nucleus is a natural spring of colossal power. When the protons and neutrons inside it rearrange, it enters a special long-lived state — a nuclear isomer. It stores energy like a spring compressed to its limit. To 'wind up' this mechanism, the nucleus is struck with an ultra-short X-ray laser pulse, carefully tuned to hit resonance. This is like spectroscopy in reverse: instead of observing a ready-made transition, we trigger it ourselves.
A wound-up spring stays compressed for an astonishingly long time. For tantalum-180, this period exceeds the age of the universe by billions of times — the energy doesn't dissipate even over thousands of generations. During discharge, entropy (a measure of energy dispersion) barely increases, so losses are negligible, and the energy density is a million times higher than that of chemical batteries. Engineers are already selecting isomers for eternal space probes and stationary storage units that won't need replacement for decades.
The tantalum-180 isomer stays charged longer than the universe has existed, an absolute record of stability.
The idea of extracting energy from nuclear isomers has popped up many times in science fiction, for instance as a source of super-powerful weapons.