A continuous variable quantum battery with wireless and remote charging

TL;DR

This paper proposes a wireless, remote charging scheme for a continuous variable quantum battery using coupled LC circuits, demonstrating that entanglement isn't necessary for energy extraction and highlighting the role of counter-rotating wave coupling.

Contribution

It introduces a novel quantum battery charging method that does not require entanglement and emphasizes the importance of counter-rotating wave interactions for energy extraction.

Findings

Energy can be fully converted into useful work without entanglement.

Counter-rotating wave coupling enhances work extraction.

Charging with thermal states is possible when both rotating and counter-rotating couplings are used.

Abstract

Quantum battery has become one of the hot issues at the research frontiers of quantum physics recently. Charging power, extractable work and wireless charging over long-distance are three important aspects of interest. Non-contact electromagnetic interaction provides an important avenue for wireless charging. In this paper, we design a wireless and remote charging scheme based on the quantized Hamiltonian of two coupled LC circuits, and focus on the charging dynamics of a continuous variable quantum battery. It is found that the quantum entanglement, which is regarded as a significant quantum resource, is not a prerequisite for charging the battery and extracting useful work. On the contrary, all of the energy in the battery could be converted into useful work in the absence of the entanglement for our model. The often overlooked counter-rotating wave coupling in the interacting Hamiltonian is helpful for extracting more useful work from the charger. If the coupling between the battery and the charger is designed to contain both the rotating and counter-rotating wave couplings, the extractable work can be obtained even if the charger is prepared in thermal states, while such effect cannot be achieved in the presence of a rotating or counter-rotating wave coupling alone. Finally, the effect of the system's parameters on the extractable work is discussed, which will provide a reference for full use of the thermal state energy.