Abstract
With microwave irradiation, the switching current of a Josephson junction coupled to amicroscopic two-level system jumps randomly between two discrete states. We modeled theswitching process of the coupled system using the quantum jump approach that is wellknown from quantum optics. The parameters that affect the character of the quantumjumps between macroscopic quantum states are discussed. The results obtained fromour theoretical analysis agree well with those of the experiments and provide aclear physical picture for macroscopic quantum jumps in Josephson junctionscoupled with two-level systems. In addition, quantum jumps may serve as a usefultool to investigate the microscopic two-level structures in solid-state systems.
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