Vacuum-enhanced charging of a quantum battery

Quantum batteries are quantum systems that store energy which can then be used for tasks. One relevant question about such concerns the differences and eventual advantages over their classical counterparts, whether in efficiency of transference, input power, total stored energy, or other physical quantities. Here, we show how a purely effect related to vacuum electromagnetic field enhance charging battery. In particular, demonstrate an anti-Jaynes-Cummings interaction derived from off-resonant Raman configuration increase effective two-level atom when compared its classically driven counterpart, eventually achieving full battery with zero entropic cost.