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Tunability of Excited-State Energy Levels of Four-Josephson-Junction Circuit in Crossover from Double-Well to Single-Well Potential
A double-loop four-Josephson-junction (4-JJ) flux qubit is a tunable qubit wherein the potential profile can be varied in situ via two applied magnetic fluxes. This provides a high level of control over state transitions. Here, we report the results of spectroscopic measurements on this system. We observed microwave resonances associated …