Demonstration of the charging progress of quantum batteries

We report an experimental simulation of charging process of an XXZ Heisenberg Hamiltonian-driven quantum battery by using single photons and linear optics. We find entanglement is not always the most important resource to boost charging, while coherence plays a nontrivial role. We construct a two-qubit quantum battery and investigate the performance of quantum batteries and their relationship with the amount of entanglement and coherence that arise during the charging process. Our finding offers insights into the design of more efficient quantum devices and advances our understanding of quantum resources.