The idea of a The functional quantum battery has moved from theory to the laboratoryA group of Australian researchers has built what is considered the first complete prototype capable of charging, storing, and releasing energy in a controlled manner—something that until now had only been explored on paper or through partial demonstrations. This breakthrough opens the door to a new way of understanding energy storage, very different from the classic chemical batteries we use every day.
What makes this development particularly striking is that Battery performance improves the larger the deviceThis is the exact opposite of what happens with conventional batteries. The technology relies on phenomena from quantum mechanics, such as superposition and entanglement, to achieve ultra-fast charging, potentially wirelessly and over long distances, with an efficiency that, if scaled up, could relegate current lithium-ion batteries to a secondary role.
What exactly is a quantum battery?
Before going into detail, it's important to understand what it means for a battery to be quantum. Unlike traditional batteries, which They store energy in the form of electrochemical reactions Within its cells, a quantum battery uses quantum states of particles (such as atoms or molecules) to store potential energy. This energy is "stored" when these particles are excited to higher energy levels and is subsequently released in a controlled manner.
In a strict sense, No battery stores raw electricity.but rather potential energy that is later converted into electricity or another type of useful work. From the lithium batteries in a mobile phone to gravity-based systems that harness the energy of tall buildings or structures, they all work by storing this capacity to do work and releasing it when needed. Quantum batteries don't change this general principle, but they do change how it's implemented.
The key leap is that The quantum battery exploits quantum mechanical phenomena such as superposition and entanglement.Instead of relying on the slow migration of ions through an electrolyte, collective quantum states are used, which allow a much faster interaction with the input energy, for example, with light from a laser.
Another important difference from classic batteries is that The internal storage units in a quantum battery do not operate independently.Far from functioning as separate cells, their behavior is strongly correlated: the system charges and evolves as a whole, giving rise to collective effects that do not occur in conventional electronics.
This means that, by increasing the number of quantum units that make up the battery, Not only is capacity increased, but loading time is also reduced.In other words, a larger quantum battery doesn't take longer to charge, but less time—a behavior completely opposite to that of the technologies we use today.
The first working prototype: who's behind the breakthrough
The milestone was achieved by a team of Australian researchers in collaboration with scientists from other countries. Among the most prominent names are: James Quach, of Australia's national science agency CSIROas well as specialists such as James Hutchison and Trevor Smith from the University of Melbourne, Daniel Tibben from RMIT University, and Kieran Hymas, also from CSIRO. Several of these centers are part of the core of cutting-edge research in photonics and quantum technologies.
This group has published its results in the journal Light: Science & ApplicationsUnder a technical paper titled, in English, “Superextensive electrical power from a quantum battery”, the article describes in detail how they have managed to make their device complete, for the first time, what is considered a full battery cycle: charging, storage and discharging of energy in a single functional system.
The concept of a quantum battery is not new: it was first proposed around 2013, and since then, theoretical models and partial proofs have been put forward. However, None of those designs had managed to integrate all phases of the operating cycle in a single practical device. Either the charge was demonstrated, but there was no useful way to extract the energy, or the required conditions (such as extreme temperatures) proved unrealistic.
Quach's team has been pursuing this idea since 2018. In 2022, they presented a first prototype that experimentally demonstrated the accelerated loading behavior as size increased, using a highly complex organic microcavityIt was a layered structure that trapped light in a very particular way. That version, however, lacked an effective mechanism for converting the trapped energy into usable electrical current.
In the new work, the researchers have taken the next step: add additional layers to the device that allow that stored energy to be transformed into electricityThus, the current prototype can not only charge and maintain energy for a limited time, but also discharge it in the form of an electric current, completing the actual operating cycle of a battery.
How the quantum battery is built and how it works
The prototype that has gone global is, in essence, a tiny organic device made up of multiple layersarranged in a kind of nanometric “sandwich.” This design is known as an organic microcavity and is specifically designed to interact with laser light very efficiently.
Charging is done wirelessly: A laser beam strikes the device and its energy is absorbed almost instantly.In what researchers describe as an episode of “superabsorption,” instead of each internal unit of the battery absorbing light independently, the system behaves as a coherent whole, collectively and extremely rapidly absorbing energy.
Once the system is excited, the energy is stored in quantum states of the organic components of the microcavityThis is analogous to what happens in atoms when an electron jumps to a higher energy orbital. This stored energy is maintained for a brief but measurable time interval, after which it can be extracted as an electric current using the layers added in the latest version of the prototype.
To achieve this behavior, the battery relies on collective quantum effectsThe microscopic units that make it up (quantum cells) do not function as small, isolated blocks, but as a single, coordinated system in which all elements are strongly correlated. This coupling gives rise to a very particular charge dynamic.
The result is that, when the number of quantum cells is increased, not only does it increase the total energy capacityBut the charging speed per cell also increases. This is what researchers describe as "super-extensive" behavior: charging power grows faster than the battery size.
The key phenomenon: larger size, shorter loading time
In lithium-ion or lead-acid batteries, any user knows this: The greater the capacity, the longer it will be connected to the charger.A mobile phone with a large battery takes considerably longer to reach 100% than one with a small battery, and an electric car requires hours to complete the charge that a gasoline tank achieves in a few minutes.
Quantum batteries completely shatter this intuition. Due to the effects of superposition and entanglement, The quantum cells that make up the battery benefit from working in unison.The more cells linked in the device, the greater the collective charging speed gain. Hence the researchers' claim: quantum batteries charge faster the larger they are.
In the current prototype, the measured times are surprising: The charging takes place on the order of femtoseconds (10⁻¹⁵ seconds), while the energy obtained is stored for nanoseconds (10⁻⁹ seconds). There is a difference of about six orders of magnitude between these two numbers.
James Quach himself illustrates this with a very graphic example: if a conventional battery were charged in one minute, That six-order-of-magnitude ratio would imply that it could remain charged for about a couple of years.In the laboratory, the absolute values are still minuscule, but the mismatch between the time it takes to charge and the time it takes to maintain the energy is what really excites the scientific community.
The energy capacities achieved by the prototype are still very limited, on the order of billions of electronvoltsThis figure, while impressive, falls far short when translated into the energy needs of a real electronic device. Nevertheless, as a proof of concept, it demonstrates that the phenomenon of super-fast charging and brief but effective storage is possible in an experimental environment at room temperature.
Current limitations and challenges to be solved
Despite the enthusiasm, the researchers themselves insist that Quantum batteries are still far from commercial useThe amount of energy the prototype can store is minuscule, and the time it keeps it useful is measured in nanoseconds, a fraction of a second that makes it completely unfeasible to power a mobile phone, a computer, or an electric car with current technology.
One of the biggest challenges is to make quantum states remain stable in the face of environmental disturbances. Any small variation in temperature, vibration, or electromagnetic noise can introduce decoherence, that is, break the delicate quantum coordination that allows for superabsorption and efficient discharge.
In the team's own words, the next step is increase the size of the device and significantly extend the charge retention timeThe ultimate goal is to build hybrid designs that combine the best of both worlds: the speed of quantum charging with the robustness and storage capacity of classic batteries.
Another worrying aspect is the energy dissipation during charging and discharging processesIn a real quantum system, losses due to interaction with the environment can practically negate the theoretical advantages. Achieving architectures that minimize these losses is one of the most active areas of research.
In addition to experimental work in Australia, there are theoretical groups in other countries, such as China, that focus on seek conceptual frameworks that make quantum batteries more resilientAmong these lines of work, the use of ideas from topology to design more stable quantum batteries stands out.
Topology and quantum batteries: the theoretical contribution from China
While Quach's group makes progress in the laboratory, other teams are working on the theoretical side to overcome practical limitations. Researchers from RIKEN Center for Quantum Computing and Huazhong University of Science and Technology They have proposed the design of a topological quantum battery that aims to achieve almost perfect energy transfer and greater immunity to dissipation.
In his analysis, published in Physical Review JournalsThey describe a model based on photonic waveguides and two-level atoms, in which the topological properties of the system allow energy to travel from one end to the other with minimal losses. This approach It takes advantage of structures that remain invariant under small deformations.This helps make the charging and discharging process more robust against the actual imperfections of the device.
According to the authors, it is possible to find configurations in which the system becomes virtually immune to dissipationThis is one of the main obstacles to quantum batteries. If these types of designs can be translated from the theoretical realm to physical devices, some of the barriers that currently prevent the transition from tiny prototypes to quantum batteries with practical applications could be overcome.
Researcher Zhi-Guang Lu, the study's lead author, emphasizes that this line of work offers clear guidelines for optimizing the performance of quantum batteries under realistic conditionsThe ultimate goal is to accelerate the transition from idealized models to microenergy storage devices that can operate outside the laboratory.
This theoretical effort complements the experimental work of teams like the Australian one, creating a research ecosystem in which theory guides new prototype designs And, in turn, the practical results provide feedback and adjust the mathematical models.
Potential applications: from quantum computing to electric cars
Quantum computers operate under the same physical laws that govern quantum batteries, and They need very precise and efficient energy sources to power their sensitive components. A quantum battery designed specifically for these systems could provide coherent power in an optimized way, reducing losses and disturbances that affect the qubits.
experts like Andrew White, director of a quantum technology laboratory at the University of QueenslandThey have emphasized that this type of device could become the missing piece for quantum computing to scale up to larger and more useful machines. The fact that a working prototype already exists demonstrates that the quantum battery is no longer mere speculation.
Looking further ahead, researchers envision applications such as wireless charging of drones in mid-flight or vehicles that charge while drivingThe ability of a quantum battery to absorb laser light remotely, wirelessly, opens the door to scenarios where charging infrastructures would be very different from the current ones.
James Quach has gone so far as to propose a future in which It is not necessary to stop an electric car at a fixed point. to recharge it, but rather to supply energy dynamically while the vehicle is in motion. All of this will depend, of course, on the technology overcoming the enormous barriers of scale and stability that it still faces.
Differences with lithium-ion batteries and possible advantages
Lithium-ion batteries are now the de facto standard in mobile phones, laptops and electric cars, but They carry well-known limitations: relatively long charging times, degradation with cycles, risks of overheating and capacity limitations that force the search for more efficient alternatives.
In theory, a quantum battery could offer much faster loading times and greater efficiency in extracting useful work of the stored energy. By relying on quantum phenomena rather than slow chemical processes, the charging speed would not be limited by ion migration, and the power generated per unit volume could be much higher.
Another potential advantage is that, if designed correctly, quantum batteries They could operate at room temperature without the need for extreme cryogenics, something fundamental for its mass adoption. The Australian prototype already works under ambient conditions, demonstrating that, at least on a small scale, an exotic environment is not necessary for these effects to manifest.
Furthermore, the possibility of long-range wireless charging using lasers This would represent a radical change in how we conceive of charging infrastructure. Imagine distributed laser charging stations powering drones, remote sensors, or vehicles, reducing the need for cables, plugs, and extended downtime.
However, we must be cautious: these advantages are, for now, promises conditional on the technology being scalable without losing key quantum propertiesUntil devices with useful storage capacities and much longer energy retention times are achieved, they will remain a laboratory complement, not an immediate replacement for current batteries.
The work of different teams around the world, from Australia to China, shows that The field of quantum batteries is entering a phase of scientific maturityThe first functional prototypes and advanced theoretical models indicate that this is not just science fiction, but a technology with real possibilities, although still limited to very small scales.
Today, the situation of quantum batteries is reminiscent of that of the first quantum computers: devices still modest and full of technical challengesBut they have already crossed the boundary between theoretical idea and tangible experiment. If researchers manage to improve stability, increase capacity, and translate topological designs from paper to chip, we could see, in the coming decades, how the concept of the battery changes as profoundly as that of computers themselves.
