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We have observed Rabi-like oscillations in a current-biased dc SQUIDpresenting enhanced coherence times compared to our previous realization\cite{Claudon_PRL04}. This Josephson device behaves as an anharmonic oscillatorwhich can be driven into a coherent superposition of quantum states by resonantmicrowave flux pulses. Increasing the microwave amplitude, we study theevolution of the Rabi frequency from the 2-level regime to the regime ofmultilevel dynamics. When up to 3 levels are involved, the Rabi frequency is aclear signature of quantum behavior. At higher excitation amplitude, classicaland quantum predictions for the Rabi frequency converge. This result isdiscussed in the light of a calculation of the Wigner function. In particular,our analysis shows that pronounced quantum interferences always appear in thecourse of the Rabi-like oscillations.

Rabi-like oscillations of an anharmonic oscillator: classical versus quantum interpretation