An energy-invariant assistant of equal dimension enables full energy extraction from any quantum battery via suitable joint unitary and assistant state.
Heat fluctua- tions and coherences in a quantum heat engine,
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Comparison of four types of qutrit-based quantum heat engines shows sequential out-and-out engines achieve unit efficiency and maximal energy transfer to the quantum battery.
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Role of energy-invariant assistants in energy extraction from quantum batteries
An energy-invariant assistant of equal dimension enables full energy extraction from any quantum battery via suitable joint unitary and assistant state.
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Harnessing energy extracted from heat engines to charge quantum batteries
Comparison of four types of qutrit-based quantum heat engines shows sequential out-and-out engines achieve unit efficiency and maximal energy transfer to the quantum battery.