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Abstract: We report measurements of coherence times of an rf SQUID qubit using pulsedmicrowaves and rapid flux pulses. The modified rf SQUID, described by andouble-well potential, has independent, in situ, controls for the tilt andbarrier height of the potential. The decay of coherent oscillations isdominated by the lifetime of the excited state and low frequency flux noise andis consistent with independent measurement of these quantities obtained bymicrowave spectroscopy, resonant tunneling between fluxoid wells and decay ofthe excited state. The oscillation-s waveform is compared to analytical resultsobtained for finite decay rates and detuning and averaged over low frequencyflux noise.

Author: Douglas A. Bennett, Luigi Longobardi, Vijay Patel, Wei Chen, Dmitri V. Averin, James E. Lukens


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