Resonant activation and multi-junction switching characteristics of Bi-2212 intrinsic Josephson junctions

Bi-2212 intrinsic Josephson junctions (IJJs) are expected to be applied to a superconductive qubit. We have studied quantum behavior of two different types of Bi-2212 IJJs, one is fabricated by FIB etching [2,3] and the other is fabricated by Double Side Etching Method (DSEM)[4]. In this report, we show their multi-junction switching properties with or without microwave irradiation. The experimental results indicate that the couplings between junctions change according to the sample fabrication process. [1] K.Inomata et al., Phys. Rev. Lett. 95, 107005 (2005) [2] S.-J.Kim et al., Appl. Phys. Lett. 74,1156 (1999) [3] Yu.I.Latyshev et. Al., JETP Lett. 69, 84 (1999) [4] H.B.Wang et al., Appl. Phys. Lett. 78, 4010 (2001)