Observation of Cascaded Two-Photon-Induced Transitions between Fluxoid States of a SQUID
Siyuan Han, R. Rouse, J. E. Lukens
DOI 10.1103/PhysRevLett.84.1300 · Physical Review Letters
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Abstract
We present evidence for transitions between fluxoid wells of a SQUID due to cascaded, two-photon processes. Such transitions are evidenced by an anomalous dependence on the transition rate from the one-photon resonant level within the initial well, which cannot be explained by previously observed macroscopic resonant tunneling. These two-photon processes may be a significant source of decoherence in SQUID qubits subject to microwave radiation.
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