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Landau-Zener-Stuckelberg interferometry has been extensively investigated inquantum two-level systems, with particular interests on artificial system suchas superconducting flux qubits. With increasing the driving field amplitude,more energy levels will be involved into the quantum evolution, which resultsin population inversion and many interesting interference patterns. Theseinterference patterns can be used to obtain the parameters characterizing thesystem and probe dephasing mechanisms of the qubit. Most recently, experimentshave been extended to the regime with higher-frequency and larger-amplitudedriving field, in which the interference pattern exhibited more complicatedcharacteristics. In this article, we give a universal description of thecharacteristics observed in both low-frequency and high-frequency regimes.Besides explaining the already observed experimental results, our theoreticalmodel predicted many interesting phenomenon, which can be demonstrated byfuture experiments.

Landau-Zener-Stuckelberg interferometry in multilevel superconducting flux qubit