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We report on two different manipulation procedures of a tunable rf SQUID.First, we operate this system as a flux qubit, where the coherent evolutionbetween the two flux states is induced by a rapid change of the energypotential, turning it from a double well into a single well. The measuredcoherent Larmor-like oscillation of the retrapping probability in one of thewells has a frequency ranging from 6 to 20 GHz, with a theoretically expectedupper limit of 40 GHz. Furthermore, here we also report a manipulation of thesame device as a phase qubit. In the phase regime, the manipulation of theenergy states is realized by applying a resonant microwave drive. In spite ofthe conceptual difference between these two manipulation procedures, themeasured decay times of Larmor oscillation and microwave-driven Rabioscillation are rather similar. Due to the higher frequency of the Larmoroscillations, the microwave-free qubit manipulation allows for much fastercoherent operations.

A tunable rf SQUID manipulated as flux and phase qubit