Efficient wireless charging of a quantum battery

Abstract

We explore the wireless charging of a quantum battery (QB) via $n$ charging units, whose coupling is mediated by a common bosonic reservoir. We consider the general scenarios in which the charger energy is not maximal and the QB has residual ergotropy initially. It is found that the charging performance improves with the increase of the coupling strength. In the strong coupling regime, the charging time is insensitive to the charger energy, the number of charging units, and the residual ergotropy in the QB, while the ergotropy charged on the QB strongly depends on the charger energy and ergotropy, and the residual ergotropy in the QB does not help to enhance its performance. Moreover, the multiple charging units help to enhance the charging performance in the weak and moderate coupling regimes, while they are less efficient in the strong coupling regime.

13 pages, 12 figures; Final version published in Phys. Rev. A

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• Magnetic Dipolar Quantum Battery with Spin-Orbit Coupling
• Charge-Preserving Operations in Quantum Batteries
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• Universal features of non-analytical energy storage in quantum critical quantum batteries
• Connection-topology--dependent energy transport and ergotropy in quantum battery networks with reciprocal and nonreciprocal couplings