Enhancing exciton transfer efficiency in an open quantum battery via architecture engineering

A critical challenge in quantum battery (QB) design is ensuring robustness against system–environment interactions while maintaining functionality. Previous studies have demonstrated that dark states in disorder-free quantum network models with site exchange symmetries can protect excitons from environmental effects, enabling loss-free storage. In this work, we investigate the impact of architectural engineering on the exciton dynamics during the discharge phase of such QB models. Using the Lindblad master equation, we analyzed the effects of dissipation and dephasing on the original QB model and proposed a new simplified configuration to optimize performance. Our findings reveal that the new model achieves a nearly complete exciton population transfer to the sink with significantly reduced leakage compared to the original design, which transfers only 7.5% of the population. In addition, we explored the role of coherent transfer mechanisms, showing that improper control of these interactions can hinder exciton extraction. This study provides an effective strategy for enhancing QB efficiency, addressing dissipation and dephasing, and mitigating leakage during the discharge phase.