Enhancing Exciton Transfer Efficiency in an Open Quantum Battery via Architecture Engineering

A critical challenge in quantum battery (QB) design is ensuring robustnessagainst system-environment interactions while maintaining functionality.Previous studies have demonstrated that dark states in disorder-freequantum network models with site exchange symmetries can protect excitonsfrom environmental effects, enabling loss-free storage. In this work,we investigate the impact of architectural engineering on the excitondynamics during the discharge phase of such QB models. Using the Lindbladmaster equation, we analyzed the effects of dissipation and dephasingon the original QB model and proposed a new simplified configurationto optimize performance. Our findings reveal that the new model achievesa nearly complete exciton population transfer to the sink with significantlyreduced leakage compared to the original design, which transfers only7.5% of the population. Additionally, we explored the role of coherenttransfer mechanisms, showing that improper control of these interactionscan hinder exciton extraction. This study provides an effective strategyfor enhancing QB efficiency, addressing dissipation and dephasing,and mitigating leakage during the discharge phase.