Fig. 2: Quantum coherence for a periodically driven qubit.
From: Nonequilibrium thermodynamics of quantum coherence beyond linear response
Change of relative entropy of coherence, \(\Delta {{{{{{{\mathcal{C}}}}}}}}\), for a two-level system in a rotating magnetic field as a function of driving frequency ω and driving amplitude g (with β = 2): \(\Delta {{{{{{{\mathcal{C}}}}}}}}=0\) along the orange lines (in particular, in the adiabatic limit ω → 0). For small driving amplitude g, \(\Delta {{{{{{{\mathcal{C}}}}}}}} \, < \, 0\) close to resonance ω ≃ ω0, enabling coherence-to-work conversion.
