We irradiated an rf superconducting quantum interference device qubit with large-amplitude and high-frequency electromagnetic field. Population transitions between macroscopic distinct quantum states due to multiple Landau-Zener transitions at energy-level avoided crossings were observed. The qubit population on the excited states as a function of flux detuning and microwave power exhibits interference patterns. Some features are found in the interference and a model based on rate equations can well address these features.
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Wang et al. (2010) studied this question.
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