Quantum battery charges by light pulse in less than a second

In an Australian research laboratory, an idea that once sounded like science fiction has become reality: a battery that receives energy not through a cable but via a pulse of light - in less than a second. The principle behind it relies on quantum physics rather than conventional chemistry. It remains a prototype, yet the implications for electric cars, smartphones and industry could be substantial.

How a quantum battery charges using quantum physics

The development comes from a team at Australia’s national research agency, CSIRO, working with the University of Melbourne and RMIT. They call it a “quantum battery” because the energy store no longer depends chiefly on slow chemical reactions, but on specific effects from quantum mechanics.

Conventional rechargeable batteries, including those in smartphones and electric cars, store power as ions move through a material and become embedded elsewhere. That takes time and produces heat, limiting service life. The Australian quantum battery uses a different method: it absorbs energy from a laser beam - in other words, from light - through an exceptionally brief collective event.

“The energy store responds as one collectively oscillating system and virtually draws in the light pulse - which is what makes charging so rapid.”

This is possible only because the battery’s components affect one another at the quantum level. Rather than each molecule taking in energy separately, many particles behave in a coordinated way at the same time.

Superabsorption: when a battery takes in energy “in one go”

In their study, published in the specialist journal “Light: Science & Applications”, the researchers use the term “superabsorption”. It refers to a kind of collective pull on energy: one short pulse of light is enough to transform the energy state of the whole system dramatically.

With ordinary rechargeable batteries, stored energy usually rises linearly with charging time. This system works differently: the laser delivers an ultra-short pulse, and the battery states move almost immediately to a higher energy level.

• The battery charges in fractions of a second rather than over minutes or hours.
• Charging is wireless, with energy entering the system optically.
• The process operates at temperatures that are technically manageable.

To measure the process at all, the team used extremely fast lasers operating on the femtosecond scale - periods of one quadrillionth of a second. Only this made it possible to demonstrate that energy uptake occurs as abruptly and collectively as quantum battery theory predicts.

The larger the quantum battery, the faster it charges

The researchers also confirmed a particularly surprising effect: the prototype indicates that a larger quantum battery charges faster than a smaller one - not merely in absolute terms, but proportionally too.

“The charging process accelerates when more quantum-mechanically coupled units are involved - entirely contrary to everyday experience with today’s rechargeable batteries.”

For conventional batteries, greater capacity slows charging. More material means more chemical processes, greater internal resistance and more heat. The quantum battery reverses that pattern: strong coupling between its individual storage units creates a collective state that makes light-energy absorption more efficient.

Scaling advantage from quantum effects

The study describes this as a “fundamental quantum-physical effect”. Put simply, if the number of participating units is doubled, the potential charging speed increases by more than double. As the battery becomes larger, so does its ability to absorb energy within an extremely short time.

For uses such as electric cars, this would be a game changer. Instead of building ever larger charging cables and charging hubs, a vehicle could theoretically receive an energy boost from a powerful light field. This remains a future prospect, but physical feasibility now appears to have been demonstrated experimentally for the first time.

What the prototype can already do - and what is still missing

The current prototype is still a laboratory set-up. It uses specialised materials whose particles are arranged in precisely tuned structures to produce the quantum-mechanical collective effect. Above all, the researchers have shown that the principle works and can be detected with measuring equipment.

Aspect	Quantum battery prototype	Today’s standard rechargeable batteries
Charging method	Laser light, wireless	Cable, electrical contacts
Charging time	Fractions of a second in the laboratory	Minutes to hours
Scaling	Larger = proportionally faster	Larger = generally slower
Maturity	Early research prototype	Industry standard

One major unanswered issue is storage duration. The prototype can absorb energy extremely quickly, but it cannot yet retain it for as long as everyday technology requires. For an electric car expected to travel hundreds of kilometres, the stored-energy state would need to remain stable for many hours or days, including during temperature changes and vibration.

What quantum batteries could make possible in everyday life

The researchers’ vision is clear: a future in which electric vehicles can be charged more quickly than combustion-engine vehicles can be refuelled. Smartphones, laptops and wearables could also charge automatically when close to an appropriate light source - without a socket or charging cable.

Possible examples include:

• Car parks with integrated laser or LED fields that top up parked electric cars in fractions of a second.
• Homes with invisible light beacons that continuously supply power to small devices.
• Industrial facilities where autonomous robots replenish their energy stores wirelessly while moving around.

These scenarios also raise safety issues. High-intensity light sources can harm eyes and skin, while sensors could be disrupted. Future systems would therefore need robust shielding, intelligent controls and strict limits, ensuring that the battery - rather than people or other devices - receives the full energy dose.

What terms such as femtosecond and superabsorption mean

A look at several technical terms helps put the study into context. A femtosecond is one billionth of one millionth of a second - put plainly, an unimaginably short interval. This is the timescale on which the fundamental movements of electrons and light waves occur.

In this context, superabsorption means that many quantum-mechanical units take in light together rather than one after another. The system acts as one large “superabsorber”, rather than as a collection of isolated small particles.

The effect requires materials manufactured with exceptional precision and capable of responding very uniformly. Even minor disruption can interfere with the collective oscillation. This is a significant technical challenge for future products: laboratory-level precision must be transferred into mass-market manufacturing.

How realistic market launch is

The researchers themselves say the “birth” of this technology has only just begun. The prototype demonstrates potential, but it does not yet replace a lithium-ion battery. Many years will pass before a car maker or smartphone manufacturer installs such a battery.

Even so, the work sends a clear signal. It shows that quantum mechanics is useful not only for quantum computers and extremely sensitive sensors, but also for something as everyday as a rechargeable battery. Several groups around the world are working on comparable concepts in parallel. Each experimental demonstration increases the likelihood that the idea will become a new segment of energy technology.

For consumers, today’s frustrating charging reality will therefore remain for some time. Long cables, waiting at rapid-charging points and power banks in a rucksack will not disappear overnight. But the quantum battery presented here provides an initial physical demonstration that a radically different route is possible: absorbing energy wirelessly in fractions of a second. If this approach continues to advance, the next generation of rechargeable batteries is already waiting in the wings - in the laboratory, at the quantum level.