CSIRO's Quantum Battery Proves Bigger Charges Faster

A Battery That Charges Faster as It Gets Bigger

Every battery engineer on Earth fights the same tradeoff: pack more energy in, wait longer to fill it up. From laptop cells to grid-scale installations, capacity and charging speed pull in opposite directions. That is why a March 2026 paper in Light: Science & Applications has drawn attention far beyond physics departments. A team led by CSIRO, Australia's national science agency, has built the world's first quantum battery that completes a full charge-store-discharge cycle — and it obeys a scaling law that turns classical intuition on its head.

The implications reach beyond the laboratory. If the physics holds at scale, it would upend a fundamental constraint that governs every energy storage technology ever built: the assumption that bigger always means slower to charge.

What CSIRO Actually Built

The device is a multi-layered organic microcavity — a thin wafer of organic molecules sandwiched between mirrors — charged wirelessly by a laser pulse. The collaboration, involving CSIRO, the University of Melbourne, and RMIT University, was led by Dr. James Quach, CSIRO's Quantum Science and Technologies Science Leader.

The prototype charges in femtoseconds — quadrillionths of a second — and retains its energy for nanoseconds, according to Decrypt, roughly six orders of magnitude longer than the charging event itself. Its total energy capacity remains minuscule, far too small to power any consumer device. But the point of this experiment was never to replace a lithium-ion cell. It was to prove that a quantum effect predicted over a decade ago actually works in a real, room-temperature device that can give its energy back.

The paper, titled "Superextensive electrical power from a quantum battery," was published in volume 15 of Light: Science & Applications, according to ScienceDaily. Its contributor list spans three institutions and includes researchers Kieran Hymas, Jack B. Muir, Daniel Tibben, Joel van Embden, and others alongside Quach and the Melbourne team.

Superabsorption: The Quantum Effect That Breaks the Rules

Classical batteries charge molecule by molecule, photon by photon. Each unit of stored energy is an independent event. Quantum batteries exploit a collective behavior called superabsorption, where molecules do not absorb energy individually but instead act as a single coordinated system.

"The system absorbs light in a single, giant 'super absorption' event and this charges the battery faster," explained Associate Professor James Hutchison of the University of Melbourne, one of the paper's co-authors.

The effect is rooted in the physics of the Dicke model, which describes how ensembles of quantum emitters couple to a shared electromagnetic field. When molecules inside the microcavity interact with confined light, they enter a collective quantum state. Instead of each molecule waiting its turn to absorb a photon, the entire ensemble absorbs energy in a correlated burst, with the rate of absorption accelerating as more molecules participate.

The scaling relationship is captured by a deceptively simple formula: charging time drops proportionally to 1/√N, where N is the number of molecules, as reported by multiple sources covering the paper. Double the number of molecules, and charging time falls by roughly thirty percent. Quadruple them, and it halves. This is precisely the opposite of what happens in a conventional battery, where more capacity means longer charge times.

As Dr. Quach noted in CSIRO's announcement, quantum batteries charge faster as they get larger — a property that today's batteries simply do not possess.

To appreciate how radical this is, consider the analogy in reverse. Imagine if filling a swimming pool took less time than filling a bathtub — not because the hose was bigger, but because the water itself cooperated differently at larger volumes. That is essentially what superabsorption achieves at the molecular level.

From 2022's Half-Answer to 2026's Full Cycle

This is not the first time superabsorption has been observed in a laboratory. In January 2022, a related team including Quach published a paper in Science Advances titled "Superabsorption in an organic microcavity: Toward a quantum battery." That experiment used Lumogen-F Orange dye molecules embedded in a polystyrene matrix, sandwiched between distributed Bragg reflectors — a similar microcavity architecture, according to the published paper.

The 2022 work confirmed that superextensive charging rates were real. Using ultrafast transient-absorption spectroscopy with sub-20 femtosecond laser pulses, the team observed superabsorption across macroscopic ensembles of more than ten billion molecules, as detailed in the Science Advances paper. But there was a critical limitation: the 2022 device could charge, but it could not discharge. The energy went in; it could not be pulled back out as usable current.

The 2026 breakthrough closes that gap. The new prototype adds layers that convert stored quantum energy into extractable electrical current — completing the full battery cycle for the first time. Energy-Storage.News described this as "a major step towards practical quantum battery" technology, noting that the 2022 device lacked the energy extraction capability that the new design provides.

The testing was performed using the University of Melbourne's Ultrafast Laser Laboratory, equipped with dual femtosecond laser amplifiers and tunable optical parametric amplifiers, according to ScienceDaily. This facility enabled the team to track energy dynamics at femtosecond resolution — fast enough to watch superabsorption happen in real time.

Why Room Temperature Matters

One detail that separates the CSIRO prototype from competing quantum battery research is that it operates at room temperature. Several other research groups — notably in China and Spain — have explored quantum battery concepts that require cryogenic cooling to maintain quantum coherence, as Decrypt noted.

Cryogenic operation is not merely inconvenient; it imposes enormous energy overhead. A quantum battery that needs a refrigeration system consuming kilowatts of power to maintain millikelvins of temperature would defeat the purpose of fast energy storage. The CSIRO team's use of organic microcavities — thin films operating in ambient conditions — sidesteps this problem entirely.

This is significant for the technology's most plausible near-term application: powering quantum computers. Current quantum processors already struggle with thermal management. A power source that introduces additional cryogenic requirements would compound the engineering challenge. A room-temperature quantum battery, even one with minimal capacity, could deliver coherent energy to quantum circuits without contributing thermal noise — a niche that no conventional power source is optimized to fill.

The Hard Road from Femtoseconds to Practicality

For all its elegance, the prototype faces formidable obstacles before it could influence any commercial technology. The most pressing is energy retention. The device holds its charge for nanoseconds — long relative to its femtosecond charging time, but absurdly short by the standards of any practical application. A smartphone battery needs to hold charge for days. An EV battery, for years.

The CSIRO team acknowledged that extending energy storage time is the critical next step. There is progress on this front: in July 2025, researchers at RMIT and CSIRO reported a method to extend quantum battery lifetimes by three orders of magnitude — a thousandfold improvement that, while dramatic in relative terms, still leaves the technology far from the retention times that real-world applications demand.

Then there is capacity. The prototype stores a negligible amount of energy — orders of magnitude below what would be needed to power even the smallest electronic component. Scaling up the number of molecules should, in theory, increase both capacity and charging speed simultaneously. But scaling introduces its own problems: concentration-dependent quenching (where molecules packed too tightly interfere with each other's energy absorption), decoherence (the loss of the quantum state that enables superabsorption), and the practical engineering of extracting current from a quantum system without destroying the very coherence that makes it work.

The 2022 Science Advances paper explicitly noted concentration-dependent quenching as a limiting factor, observing that molecular densities above certain thresholds degraded the superabsorption effect, according to the published results. Solving this will likely require new materials or novel cavity architectures that maintain quantum coherence at higher molecular densities.

Dr. Quach framed the long-term vision optimistically: "If we can charge a battery in one minute, it would stay charged for a couple of years," he told Decrypt. That scenario would require improvements in retention time spanning many orders of magnitude — a gap that separates proof-of-concept physics from deployable technology.

Where Quantum Batteries Fit in the Energy Landscape

It is tempting to project quantum batteries into the electric vehicle conversation — the idea of charging a car in seconds rather than hours is irresistible. But the honest near-term picture is more targeted. Quantum batteries are most likely to find their first applications in quantum computing infrastructure, where their unique properties — coherent energy delivery, ultrafast charging, room-temperature operation — address real pain points that conventional power sources handle poorly.

Beyond quantum computing, the superabsorption principle could influence solar energy harvesting. The 2022 Science Advances paper explicitly noted that superabsorption could have important implications for energy capture technologies, particularly in platforms compatible with organic photovoltaic devices, according to the published research. If organic microcavities can absorb sunlight collectively rather than molecule-by-molecule, the theoretical efficiency gains for solar cells could be meaningful — though this application remains speculative and would require substantial further development.

CSIRO has signaled that it is actively seeking development partners to advance the technology, according to the agency's announcement, suggesting it sees a path — however long — toward commercial applications. The most realistic trajectory likely involves hybrid designs that pair quantum charging speed with conventional storage media, combining the best of both worlds rather than replacing lithium-ion outright.

The broader significance of this work may not be the battery itself but what it proves about quantum collective effects in engineered systems. Superabsorption was a theoretical prediction for over a decade before CSIRO turned it into a measurable, repeatable phenomenon. Each step — from mathematical prediction in 2013, to partial demonstration in 2022, to full-cycle operation in 2026 — narrows the gap between quantum theory and quantum engineering. Whether quantum batteries ever power an electric vehicle matters less than whether the physics they validate opens doors to technologies we have not yet imagined.

Key Takeaways

• First complete cycle: The CSIRO-led team demonstrated the world's first quantum battery that charges, stores energy, and discharges it as electrical current — closing a gap the 2022 prototype left open.
• Superabsorption is real and scales: The counterintuitive 1/√N scaling law — where larger batteries charge faster — has been experimentally validated in a room-temperature device.
• Room temperature is a differentiator: Unlike competing approaches requiring cryogenic cooling, the organic microcavity design operates in ambient conditions, making it more practical for eventual integration.
• Retention is the bottleneck: Nanosecond storage times must improve by many orders of magnitude before any practical application becomes feasible.
• Quantum computing comes first: Consumer applications like EVs remain distant; coherent power delivery for quantum processors is the most plausible near-term use case.