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By quickly modifying the shape of the effective potential of a double SQUIDflux qubit from a single-well to a double-well condition, we experimentallyobserve an anomalous behavior, namely an alternance of resonance peaks, in theprobability to find the qubit in a given flux state. The occurrence ofLandau-Zener transitions as well as resonant tunneling between degeneratelevels in the two wells may be invoked to partially justify the experimentalresults. A quantum simulation of the time evolution of the system indeedsuggests that the observed anomalous behavior can be imputable to quantumcoherence effects. The interplay among all these mechanisms has a practicalimplication for quantum computing purposes, giving a direct measurement of thelimits on the sweeping rates possible for a correct manipulation of the qubitstate by means of fast flux pulses, avoiding transitions to non-computationalstates.

Resonant effects in a SQUID qubit subjected to non adiabatic changes