Macroscopic resonant tunneling in an rf-SQUID flux qubit under a single-cycle sinusoidal driving*

Project supported by the National Natural Science Foundation of China (Grant Nos. 11474154, 61371036, 61571219, 11227904, and 61501222) and the Natural Science Fund for Distinguished Young Scholars of Jiangsu Province, China (Grant No. BK2012013) and PAPD.

Shi Jianxin1, 2, Xu Weiwei1, †, Sun Guozhu1, ‡, Chen Jian1, Kang Lin1, Wu Peiheng1
       

(color online) (a) Schematic picture of double-well potential of the rf-SQUID flux qubit driven by a single-cycle sinusoidal signal. The initial state is a symmetric double-well potential (red line) in Fig. 2(a). (b) Energy-level structure of the rf-SQUID flux qubit with parameters measured in the experiment.