Abstract
Josephson junction devices are good candidates for quantum computation. A large energysplitting was observed in the spectroscopy of a superconducting Josephson junction. Thepresence of the critical current fluctuation near the energy splitting indicated couplingbetween the junction and a two-level system. Furthermore, we find that this fluctuation ismicrowave dependent. It only appears at certain microwave frequency. This relationsuggested that the decoherence of qubits is influenced by the necessary computingoperations.
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