science π Spin coupling boosts quantum battery storage, but work output drops
Researchers found that enhancing dipolar interaction in a two-qubit system significantly boosted maximum ergotropy when used as a quantum battery. This study was conducted at Mohammed V University and Ibnou Zohr University, reporting a 15 percent increase in charging power. The research reveals a complex trade-off between energy storage capacity and the work extractable from a quantum Otto heat engine. While storage capacity rose sharply with greater dipolar coupling, the maximum work obtainable decreased slightly under stronger interactions. This challenges the assumption that improved energy retention automatically leads to better power output in quantum devices.