A world‑first quantum battery charges faster when it gets bigger—but it's tiny and only lasts nanoseconds

Imagine your phone charging faster the larger its battery got. That's not how anything works — except, apparently, in the quantum realm.

A team from CSIRO, Australia's national science agency, working with researchers at RMIT University and the University of Melbourne, has built what they describe as the world's first fully functioning proof-of-concept quantum battery. The prototype, detailed in the journal Light: Science & Applications, charges in femtoseconds and holds that charge for nanoseconds.

The counterintuitive behavior stems from what the researchers call "collective effects" — a quantum phenomenon in which the storage units of a quantum battery don't act individually but behave collectively during charging. The charging time scales as one over the square root of the number of storage units. More units means faster individual charging. Doubling the battery's size doesn't double the charge time; it reduces it to roughly 70%.

This is not how conventional batteries behave. A larger lithium-ion cell takes longer to charge, not less time per unit. It's why charging a phone takes minutes and charging an electric car takes hours.

A full cycle, finally

The CSIRO team demonstrated this charging advantage back in 2022, but that prototype had no mechanism to extract the stored energy. The new work adds that step: charge, store, discharge as electrical current. The full cycle. That is the advance.

Lead researcher James Quach at CSIRO frames it as proof that quantum batteries have moved beyond theory. "It's the first prototype which does a full cycle of a battery: in other words, you charge it, you store energy, and you can discharge it," he told The Guardian.

The numbers remain the honest story. Current capacity: a few billion electron-volts. "Not enough to power anything useful," Quach acknowledges. Charging takes femtoseconds. Storage lasts nanoseconds.

What it's actually for

The most plausible near-term application isn't consumer electronics. It's quantum computers. Quantum computers need classical control electronics to manage their qubits — and those control systems need power. Quantum batteries, with their ability to charge extremely fast, could eventually serve that niche, eliminating some of the infrastructure overhead that currently makes scaling quantum systems difficult.

"Probably the first place that it'll have an impact is actually for quantum computers," said Prof. Andrew White of the University of Queensland's quantum technology laboratory, who was not involved in the research.

The idea of a quantum battery was first proposed theoretically in 2013. That it now exists as a working prototype, however small and brief, is real progress. Whether it scales into something that matters outside a lab is the open question.

The Wright brothers' first flight lasted 12 seconds. Progress takes time.