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As a model of so-called quantum battery (QB), quantum degrees of freedom asenergy storage, we study a charging protocol of a many-body QB consisting of$N$ two-level systems (TLSs) using quantum heat engines (QHEs). We focus on thecollective enhancement effects in the charging performance of QBs in comparisonto the individual charging. It is a challenging goal of QBs to achieve largecollective enhancements in the charging power and the capacity while keepingthe experimental feasibility, the stability, and the cheapness of the requiredcontrol and resources. We show that our model actually exhibits these features.In fact, our protocol simultaneously achieves the asymptotically-perfect chargeand almost $N$-order average power enhancement with only thermal energyresource and simple local interactions in a stable manner. The capacity iscollectively enhanced due to the emergent bosonic quantum statistics caused bythe symmetry of the interaction between the engine and the batteries, whichresults in asymptotically perfect excitation of all the TLSs. The chargingspeed, and hence the average power are collectively enhanced by thesuperradiance-like cooperative excitation in the effective negativetemperature. Our results suggest that QHEs actually fit for a charger of QBs,efficiently exploiting the collective enhancements, not only converting thedisordered thermal energy to the ordered energy stored in quantum degrees offreedom.

Collectively enhanced high-power and high-capacity charging of quantum batteries via quantum heat engines