Physics – Quantum Physics
Scientific paper
2009-07-14
Supercond. Sci. Technol. 22, 114016 (2009)
Physics
Quantum Physics
6 pages, 7 figures; Invited article for special issue (ISEC 09) in Supercond. Sci. Technol. (2009)
Scientific paper
With microwave irradiation, the switching current of a Josephson junction coupled to a microscopic two-level system jumps randomly between two discrete states. We modeled the switching process of the coupled system with quantum jump approach that was generally used in quantum optics. The parameters that affect the character of the quantum jumps between macroscopic quantum states are discussed. The results obtained from our theoretical analysis agree well with those of the experiments and provide a clear physical picture for the macroscopic quantum jumps in Josephson junctions coupled with two-level systems. In addition, quantum jumps may serve as a useful tool to investigate the microscopic two-level structures in solid-state systems.
Chen Jian
Dong Ning
Kang Lin
Sun Guozhu
Wang Yiwen
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