Power-law-graded Ising interactions stabilize discrete time crystals in Floquet-driven spin-1/2 chains, yielding superlinear energy storage as a quantum battery and superextensive quantum Fisher information for timing sensing beyond the Heisenberg limit.
Auxiliary-assisted stochastic energy extraction from quantum batteries,
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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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Power-law-graded Ising Interactions Stabilize Time Crystals Realizing Quantum Energy Storage and Sensing
Power-law-graded Ising interactions stabilize discrete time crystals in Floquet-driven spin-1/2 chains, yielding superlinear energy storage as a quantum battery and superextensive quantum Fisher information for timing sensing beyond the Heisenberg limit.
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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.