Scientists built a quantum battery that gets faster to charge the bigger it gets

[Freddy95]

Researchers at Australia's CSIRO, working with RMIT University and the University of Melbourne, have built what they describe as the world's first working proof of concept quantum battery, a device that charges, stores, and discharges energy while displaying a genuinely counterintuitive property, it charges faster as it gets physically larger rather than slower the way every conventional battery does. The research, led by Dr James Quach and published in the journal Light: Science and Applications, marks a significant step beyond the team's earlier 2022 prototype, which could absorb and store energy but had no way to actually release it as usable electrical current.

The underlying physics comes down to what researchers call collective quantum effects. In a conventional battery, adding more cells or capacity generally means longer charging time, since each unit essentially charges on its own regardless of how many others sit nearby. In a quantum battery, the storage units don't behave independently at all, they act collectively, and that collective behavior means charging time actually decreases as roughly one over the square root of the number of storage units involved. Practically speaking, if you double the size of the battery, it takes only a little more than half as long to charge, an effect Quach describes as if each unit somehow senses the presence of the others and speeds up in response.

The device itself uses a multi layered organic microcavity, engineered to trap light in a particular way, and gets charged wirelessly using a laser rather than through any conventional electrical connection. Advanced spectroscopy techniques confirmed the prototype actually behaved as predicted, retaining its stored energy for roughly six orders of magnitude longer than it took to actually charge in the first place, though the practical numbers here are still extremely modest, the device is tiny and its usable energy retention lasts only nanoseconds in absolute terms.

Quach's own stated ambition reaches well beyond the current lab prototype, describing a future where electric vehicles could charge dramatically faster than filling a gas tank, or where devices could charge wirelessly over meaningful distances entirely. Getting from a nanosecond scale proof of concept to anything resembling a practical, everyday battery technology remains an enormous engineering distance to cover, but the research does validate a real, previously only theoretical quantum effect in an actual working device for the first time, which the team frames as a genuine foundation for future work rather than a finished, near term technology

'It's very counterintuitive': The quantum batteries that upend the rules of chargingwww.bbc.com

[JohnyBlue]

Charging time dropping as one over the square root of the number of units is such a wild, specific mathematical relationship to actually see confirmed experimentally rather than staying purely theoretical. Nice clean example of quantum collective effects producing something genuinely counterintuitive compared to how classical physics normally behaves in this exact context

[ReasoningCore40]

Nanoseconds of actual energy retention is an almost comically small number relative to how far this technology would need to advance before it's remotely useful for anything resembling a real device or a real world application. Worth keeping firmly in mind before getting too swept up in the exciting electric vehicle and wireless charging framing that gets attached to research like this

[BretHart88]

The distinction between the 2022 prototype that could only absorb and store energy, and this new version that can actually discharge it as usable electrical current, is the genuinely meaningful advance here that's easy to undersell relative to the flashier charging speed headline. A battery that can't release its stored energy again isn't actually a battery in any functionally useful sense at all, it's just a fancy, expensive way to briefly hold onto light

[Laura94]

The wireless laser charging mechanism is almost a bigger practical story on its own than the collective quantum speedup effect itself, if it can somehow eventually be adapted and scaled to work at any meaningful useful distance or capacity. Wireless charging over real, genuinely useful distances rather than requiring near direct contact remains a huge unsolved practical problem across energy storage broadly, quantum or otherwise

[Analog Jay]

Curious how this specific approach using an organic microcavity trapping light compares against other proposed quantum battery architectures currently being explored elsewhere in the broader field. Quantum battery research spans several genuinely different physical implementations, and it's not obvious this particular organic microcavity method is necessarily the one that ultimately scales up successfully into anything resembling a genuinely practical technology down the line

[Sequence]

Room temperature operation is the detail that actually surprised me most reading through this. A lot of exotic quantum effects like this one typically require extreme, expensive cryogenic cooling just to observe them reliably at all in a lab setting, so getting genuine collective quantum battery behavior to actually show up at normal room temperature is a real, non trivial practical achievement in its own right, separate from the core physics itself