A quantum battery is a two-level system (qubit) charged by a coherent driving field. Ergotropy W is the maximum work extractable by unitary operations: W = Tr[ρH] − min_U Tr[UρU†H]. Quantum coherence can enhance charging power over classical.
Energy: 0.000
Ergotropy W: 0.000
Entropy S: 0.000
Charging power P: 0.000
Coherence |ρ₀₁|: 0.000
H = ½ωσz + λcos(Ωt)σx
W = Tr[ρH] − ε_passive
ε_passive = min eigenvalue arrangement