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Electron Paramagnetic Resonance experiments show that the decay of Rabioscillations of ensembles of spin qubits depends noticeably on the microwavepower and more precisely on the Rabi frequency, an effect recently called"driven decoherence". By direct numerical solution of the time-dependentSchr\"odinger equation of the associated many-body system, we scrutinize thedifferent mechanisms that may lead to this type of decoherence. Assuming theeffects of dissipation to be negligible ($T_1=\infty$), it is shown that asystem of dipolar-coupled spins with -- even weak-- random inhomogeneities issufficient to explain the salient features of the experimental observations.Some experimental examples are given to illustrate the potential of thenumerical simulation approach.

Quantum simulations and experiments on Rabi oscillations of spin qubits: intrinsic {\sl vs} extrinsic damping