Quantum Battery Charges in a Femtosecond, Lasts Years

Imagine charging your phone for one minute and not needing to plug it in again for years. That future just got a lot closer.

Researchers at the University of Melbourne and CSIRO have created the world's first miniature quantum battery, a breakthrough that could revolutionize how we power everything from electric cars to aircraft. Published in the journal Light: Science & Applications, this tiny prototype charges in just a femtosecond (one-quadrillionth of a second) using a laser pulse.

Traditional batteries move ions between electrodes through chemical reactions. Quantum batteries work completely differently, storing energy as electromagnetic excitation among molecules that act as one unified system through quantum entanglement.

The magic happens in a microscopic structure called a microcavity, where organic semiconductor layers sit sandwiched between silver mirrors. When researchers fired a laser pulse at the battery, it created an excited state that lasted tens of nanoseconds, meaning the battery held its charge for one million times longer than it took to charge.

Scale that up, and a battery that charges in one minute could stay powered for years, according to lead researcher James Quach. The secret lies in quantum mechanics: the more molecules you add, the faster the charging becomes, not slower.

The battery relies on a phenomenon called superabsorption, where coherent molecules absorb light collectively at a rate equal to the number of molecules squared. When discharging, they emit light in one unified pulse through a process called superradiance.

The Ripple Effect

This isn't just about faster phone charging. If researchers can scale up the technology while protecting it from environmental interference (a challenge called decoherence), the applications could transform our world.

Remote charging via lasers could power drones and aircraft mid-flight, eliminating weight from onboard batteries. Heavy electric vehicles could benefit from the high energy density. Remote locations could get lightweight, long-lasting power sources.

Andrew White from the University of Queensland sees immediate potential for powering quantum computers at extremely low energy costs. The technology could enable electrification in places traditional batteries can't reach.

The next hurdle is scaling up while maintaining quantum behavior, which is fragile and easily disrupted by environmental noise. But the team has proven the concept works, and that's the hardest part.

After years of theoretical discussions about quantum batteries, we now have a working prototype sitting in a lab in Australia, ready to inspire the next generation of energy storage.