TL;DR
Get the latest gadgets delivered free — and shop member deals
- Fast, free delivery on millions of items
- Access to Prime Big Deal Days deals on October 6–7
- Prime Video, Amazon Music and more included
A theoretical study published in PRX Quantum finds that quantum uncertainty limits how reliably a quantum battery can deliver energy and power at once. Collective charging can raise power while also increasing power fluctuations; charging interacting groups may offer a compromise, according to the researchers.
Researchers have identified a quantum-mechanical limit on how steadily a quantum battery can deliver energy and power: fluctuations in both cannot be made arbitrarily small at the same time. The theoretical study, published in PRX Quantum, also finds that charging cells collectively can raise power while increasing power fluctuations, a result that complicates efforts to judge these devices by charging speed or power alone.
The study, titled Fundamental Limitations on the Reliabilities of Power and Work in Quantum Batteries, examines fluctuations in the work, or energy delivered, and in the rate of delivery, or power. The researchers define reliability and stability in terms of keeping those fluctuations small compared with their respective average values. Their analysis finds that the two measures cannot both be made arbitrarily stable in a closed quantum battery.
The authors trace the constraint to a quantum uncertainty relation: work and power are represented by non-commuting operators in the systems they study. That makes the limit a feature of the theoretical framework, rather than simply a practical shortcoming that could be removed by choosing a faster charging method. The paper does not establish how the trade-off will appear in every real battery design.
The team compared three charging arrangements. In parallel charging, cells operate independently; in collective charging, they participate together; and hybrid approaches let groups of cells interact. The study reports that stronger collective charging raises power but also increases power fluctuations, lowering power reliability. The researchers say charging interacting groups can provide a compromise between power and stable operation.
Power Gains Bring Larger Fluctuations
The findings suggest that maximum power alone is an incomplete measure of a quantum battery’s performance. A device that transfers energy quickly may deliver it less steadily, while a design tuned for steadier output may give up some power enhancement. For applications that need predictable energy delivery, both measures would matter when comparing charging strategies.
Quantum batteries are being studied as possible future energy-storage resources for quantum processors and other quantum technologies. Those uses remain prospective: this paper establishes theoretical constraints and compares models; it does not demonstrate a practical battery powering a processor. The result helps define questions that later experiments and engineering work will need to address, including how much fluctuation a given application can tolerate.
The authors also examined systems with transverse Ising-like interactions and report the same qualitative power-reliability trade-off. That finding indicates the effect is not confined to the simplest model considered, although it does not show that the same quantitative limits hold across all platforms or operating conditions.
From Charging Speed to Reliability
Research on quantum batteries is an emerging field, involving theoretical studies and proof-of-principle experiments in small quantum systems. Unlike conventional chemical batteries, these systems use quantum systems to store and transfer energy. Researchers are exploring whether they might eventually support quantum technologies, but they are not established replacements for everyday batteries.
Earlier work has often focused on how quickly or powerfully quantum batteries can be charged. The new study addresses a different performance question: whether the energy and power delivered during charging can also be reliable and stable. By comparing independent, collective and intermediate group charging, the researchers connect that question to the way cells interact, rather than treating charging speed as the only target.
The work was conducted by Brij Mohan of the University of Oulu, Tanmoy Pandit of VTT in Espoo, Maciej Lewenstein of ICFO, and Manabendra Nath Bera of IISER Mohali. The publication is listed as PRX Quantum 7, 033057 (2026). The source material identifies it as a theoretical study and does not report a test of the proposed strategies in a working energy-storage device.
“A quantum battery ideally should not only be fast and powerful but also needs to charge or deliver energy in a reliable and stable manner at the same time. Our work shows that quantum mechanics places fundamental limits on the reliabilities of quantum batteries.”
— Brij Mohan, University of Oulu postdoctoral researcher and first author
Real-World Performance Remains Open
The results are theoretical, and the source material does not establish that a quantum battery built on an experimentally available platform will show the same degree of fluctuation or the same balance among charging strategies. The authors report a qualitative trade-off in a second, Ising-like model, but the limits’ size across different designs is not specified in the supplied report.
How noise, energy loss and interaction with the surrounding environment affect the result also remains open. The reported analysis concerns closed quantum batteries; the researchers say they plan to study noise, dissipation and open-system dynamics. No timeline, experimental demonstration, or quantitative application target is given in the source material.
Testing Noisy, Open Systems
The researchers say their next work will examine reliability limits under noise and dissipation, as well as in open-system dynamics and experimentally relevant quantum platforms. Those studies could show whether the trade-off persists when a battery interacts with its surroundings and whether intermediate-range charging remains a useful compromise under realistic conditions.
For now, the publication provides a theoretical framework for comparing power and delivery stability. Experimental results and more realistic models will be needed to establish how the limits apply to specific devices and whether any charging strategy can meet the needs of a particular quantum technology.
Key Questions
What limit did the researchers identify?
They found that quantum uncertainty prevents fluctuations in delivered energy and power from both being made arbitrarily small at the same time in the closed quantum batteries studied.
Does collective charging improve quantum battery performance?
The study reports that collective charging increases power but also increases power fluctuations. The result points to a trade-off rather than an across-the-board improvement.
What charging approach may offer a compromise?
The researchers say charging interacting groups of cells may balance higher power with more stable operation. The supplied report does not describe a practical device test of that approach.
Has this result been confirmed experimentally?
The source describes a theoretical study and does not report experimental confirmation of these limits in a working quantum battery.
What will the researchers study next?
They say they plan to examine the limits under noise, dissipation and open-system dynamics, including on experimentally relevant quantum platforms.
Source: rss
Fall Picks
fall essentials
As an affiliate, we earn on qualifying purchases.
