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The coherent dynamics of relaxing spin qubits driven by a classicalbichromatic field comprising a strong resonant component and a weaker componentwith a frequency close to the strong-field Rabi frequency is studied. Thedouble dressing by the bichromatic field modifies dephasing and dissipationprocesses. We demonstrate that detuning of the weaker-field frequency from thestrong-field Rabi frequency prolongs the decay of Rabi oscillations betweensome doubly dressed states. The sensitivity of Rabi oscillations to themodified detuning-dependent relaxation is illustrated for nitrogen-vacancyqubits in diamond. We discuss a steady-state population inversion of the doublydressed-state levels.

Relaxation, decoherence and steady-state population inversion in qubits doubly dressed by microwave and radiofrequency fields