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Abstract
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Energy can be stored in quantum batteries by electromagnetic fields as chargers. In this paper, the performance
of a quantum battery with single and double chargers is studied. It is shown that by using two independent
charging fields, prepared in coherent states, the charging power of the quantum battery can be significantly
improved, though the average number of embedded photons are kept the same in both scenarios. The results
reveal that for the case of initially correlated states of the chargers, the amount of extractable energy, measured
by ergotropy, is more than initially uncorrelated ones, with appropriate degrees of field intensity. Though the
correlated chargers lead to greater reduction in the purity of the quantum battery, more energy and in turn more
ergotropy are stored in this case. In addition, we study the battery-charger mutual information and von Neumann
entropy and by using their relation we find that both quantum and classical correlations are generated between
the quantum battery and chargers. We also study quantum consonance of the battery as the nonlocal coherence
among its cells and find some qualitative relations between the generation of such correlations and the capability
of energy storage in the quantum battery.
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