Quantum interference induced by multiple Landau-Zener transitions in a strongly driven rf-SQUID qubit
Yiwen Wang, Shanhua Cong, Xueda Wen, Cheng Pan, Guozhu Sun, Jian Chen, Lin Kang, Weiwei Xu, Yang Yu, Peiheng Wu · Physical Review B · 2010
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.