Good news! This seems to be very preliminary, unpublished research and it refers back to research published already in March of 2026.
"... a device that charges faster the bigger it gets. For now, it only holds a charge for nanoseconds."
"... In March 2026, his team made an important breakthrough when they unveiled what they say is the world's first working quantum battery prototype. ...
latest experiment represents a first tentative step towards a quantum battery that could one day be substituted for conventional ones. However, at present, the prototype battery can only hold a very small amount of energy – a few billion electron volts – for a matter of nanoseconds. ...
Quach says he has in fact already achieved this with a new design he's built, and is now working on a paper to publish the results. It uses "a hybrid structure", he says, involving quantum components to allow super-fast charging with classical layers added in to store the energy for longer.
He also plans to combine many microscopic quantum batteries together to increase their total capacity. ..."
"... One strange feature of the quantum world is what are called “collective effects”. They are what give quantum batteries their unique properties.
Under the right circumstances, the storage units of quantum batteries don’t act individually, but behave collectively. In a counterintuitive twist, this means the units charge faster together than if they were charging alone.
Let’s say your quantum battery has N storage units, and each unit takes one second to charge. Collective effects mean that if all units are charged at once, each unit will take only 1∕√N seconds to charge.
This means that the bigger your quantum battery, the less time it takes to charge. If it doubles in size, charging will take just a little more than half as long. ..."
From the abstract:
"Superextensivity, where the response of a physical system scales super-linearly with size, originates from collective quantum effects and provides a promising route to augment next-generation quantum technologies.
While recent work has demonstrated superextensive behaviour in the coherent dynamics of quantum systems, these effects typically occur on short timescales, prohibiting their practical utility.
In contrast, triggering steady-state superextensive effects in, for example, a generated electric current, remains unexplored despite the immediate impact on photovoltaic technologies.
Here, we utilise a microcavity quantum battery as an experimental platform that superextensively captures light energy and converts it to an electric current via the incorporation of charge transport layers into the resonant microcavity.
This architecture enables, for the first time, a complete quantum battery charge-discharge cycle. We demonstrate that strong light–matter coupling induced by the microcavity leads to superextensive scaling of the steady-state electrical discharging power under low-intensity, incoherent illumination.
Our results provide the first experimental demonstration of superextensive light-to-charge conversion in steady-state, highlighting the feasibility of leveraging strong light–matter coupling for enhanced energy harvesting under low-light conditions."
'It's very counterintuitive': The quantum batteries that upend the rules of charging "Scientists have made the world's first quantum battery prototype and, unlike conventional batteries, it charges faster the larger it gets. Could these bizarre devices one day power quantum computing – or even your phone?"
A world-first quantum battery charges faster when it gets bigger – but it’s tiny and only lasts nanoseconds (original news release, but from March 2026) "In quantum batteries, subunits take collective action to charge faster."
Superextensive electrical power from a quantum battery (open access, published March 2026, I blogged here about this paper)
Fig. 1: Composition of the quantum battery tuned for strong light–matter coupling.
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