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<\/a><\/p>\nA quantum battery exploits quantum correlations between its component cells to achieve charging and discharging rates that are unattainable for classical devices (see Viewpoint: Sizing Up the Potential of Quantum Batteries<\/a>). Now Brij Mohan at the University of Oulu in Finland and colleagues have quantified the trade-off between that advantage and a quantum battery\u2019s ability to deliver steady, reliable energy [1<\/a>]. The researchers also identified a battery architecture that optimizes both performance and reliability.<\/p>\n Central to the team\u2019s analysis is the relationship between power and work. Like momentum and position, in quantum physics these quantities are noncommuting, which means that their fluctuations cannot be simultaneously reduced to arbitrarily small values. Consequently, reducing the battery\u2019s power fluctuations increases the fluctuation in the total work delivered, and vice versa. The inherent quantum dynamical fluctuations that affect each quantity independently also come into play.<\/p>\n Mohan and colleagues considered these uncertainties and set theoretical lower limits on the power or work fluctuations for a given value of the other quantity. Then they investigated how changing the \u201cquantumness\u201d of the battery affects these limits. A battery in which each cell charges or discharges independently is said to be uncorrelated. As more cells are added to such a battery, the product of the power and work fluctuations drops quadratically\u2014that is, as the square of the number of cells\u2014and assumes a small value. But its power increases only linearly. For a battery of fully correlated cells, power scales quadratically as cells are added, but the product of the power and work fluctuations is maximal. A battery with range-limited interactions, in which more distant cells are uncorrelated, hits the sweet spot between power scaling and reliability.<\/p>\n \u2013Marric Stephens<\/p>\n Marric Stephens is a Corresponding Editor for\u00a0Physics Magazine<\/a> based in Bristol, UK.<\/p>\n ReferencesB. Mohan et al., \u201cFundamental limitations on the reliabilities of power and work in quantum batteries,\u201d PRX Quantum 7, 033057 (2026)<\/a>.Subject AreasQuantum Physics<\/a>Energy Research<\/a>Related Articles Theorists find a persistent signature of a chaotic quantum system\u2019s initial state, implying a memory effect\u2014called a quantum birthmark\u2014that resists thermodynamic equilibration. Read More \u00bb<\/a><\/p>\n Simulations suggest that clouds can reduce the length of a wind farm\u2019s slow-air wake, potentially increasing power production of neighboring wind farms. Read More \u00bb<\/a><\/p>\n<\/a>Complex SystemsQuantum States Cannot Hide Their Origin<\/a>September 10, 2026<\/p>\n<\/a><\/a>Energy ResearchThe Effect of Clouds on Wind Farms<\/a>September 2, 2026<\/p>\n