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This research demonstrates a significant breakthrough in quantum thermodynamics by showing that enhancing dipolar interactions can simultaneously increase both energy storage capacity and power output in two-qubit systems, overcoming previous trade-offs between these metrics. The findings provide a new theoretical threshold for optimizing multifunctional quantum devices that serve as both batteries and heat engines, offering independent control over energetic parameters through microscopic spin manipulation.
Researchers Link Spin Coupling to Differing Energy Efficiencies
Increasing dipolar interaction simultaneously boosts a system’s ability to store energy yet diminishes its power output per thermodynamic cycle. This counterintuitive behaviour contrasts sharply with responses observed from altering temperature or magnetic fields. Such trade-offs are becoming increasingly apparent as designs converge for multifunctional quantum devices combining both battery and engine capabilities.
An interacting two-qubit system functions as both a quantum battery and a quantum Otto heat engine. The working medium is described by an anisotropic Heisenberg Hamiltonian supplemented by a dipolar interaction, a symmetric spin, orbit interaction, and an external magnetic field. A coherent unitary charging protocol was first analysed within a unified microscopic framework, with resulting…
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