title: Quantum jumps between macroscopic quantum states of a superconducting qubit coupled to a microscopic two-level system.
abstract: We report the observation of quantum jumps between macroscopic quantum states in a superconducting phase qubit coupled to the two-level systems in the Josephson tunnel junction, and all key features of quantum jumps are confirmed in the experiments. Moreover, quantum jumps can be used to calibrate such two-level systems, which are believed to be one of the main decoherence sources in Josephson devices.
authors.affiliation: National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, China. yuyang@nju.edu.cn
authors.forename: Yang
authors.initials: Y
authors.lastname: Yu
authors.forename: Shi-Liang
authors.initials: SL
authors.lastname: Zhu
authors.forename: Guozhu
authors.initials: G
authors.lastname: Sun
authors.forename: Xueda
authors.initials: X
authors.lastname: Wen
authors.forename: Ning
authors.initials: N
authors.lastname: Dong
authors.forename: Jian
authors.initials: J
authors.lastname: Chen
authors.forename: Peiheng
authors.initials: P
authors.lastname: Wu
authors.forename: Siyuan
authors.initials: S
authors.lastname: Han