Entanglement-Driven Energy Exchange in a Two-Qubit Quantum Battery

Abstract: This study investigates the dynamics of quantum batteries (QBs), focusing on the pivotal role of quantum entanglement in mediating inter-cellular energy transfer within a two-cell configuration (two-qubit), wherein one cell is directly coupled to the charging source. Employing the Lindblad master equation to model the system's evolution, the influence of coherent state amplitudes, detuning, inter-cellular coupling strength, and dissipation rates on stored energy, energy fluctuations, concurrence-quantified entanglement, and their parametric interrelations is scrutinized. Our results indicate a direct correlation between the degree of entanglement and energy transfer efficiency between the qubits. Specifically, the stronger the entanglement between primary cell, which is connected to the charger, and secondary cell, the more effectively energy is transferred. This demonstrates that enhanced entanglement significantly facilitates energy transfer between the two qubits.