Critical current fluctuation in a microwave-driven Josephson junction
Ning Dong, Guozhu Sun, Yiwen Wang, Cao Junyu, Yang Yu, Jian Chen, Lin Kang, Weiwei Xu, Siyuan Han, Peiheng Wu · Superconductor Science and Technology · 2007
Josephson junction devices are good candidates for quantum computation. A large energy splitting was observed in the spectroscopy of a superconducting Josephson junction. The presence of the critical current fluctuation near the energy splitting indicated coupling between the junction and a two-level system. Furthermore, we find that this fluctuation is microwave dependent. It only appears at certain microwave frequency. This relation suggested that the decoherence of qubits is influenced by the necessary computing operations.