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Abstract: Nonlinear effects in mesoscopic devices can have both quantum and classicalorigins. We show that a three-Josephson-junction (3JJ) flux qubit in the classical regime can produce low-frequency oscillations in the presence of anexternal field in resonance with the (high-frequency) harmonic mode of thesystem, $\omega$. Like in the case of quantum Rabi oscillations, the frequencyof these pseudo-Rabi oscillations is much smaller than $\omega$ and scalesapproximately linearly with the amplitude of the external field. This classicaleffect can be reliably distinguished from its quantum counterpart because itcan be produced by the external perturbation not only at the resonancefrequency $\omega$ and its subharmonics ($\omega-n$), but also at itsovertones, $n\omega$.



Author: A.N. Omelyanchouk, S.N. Shevchenko, A.M. Zagoskin, E. Il'ichev, Franco Nori

Source: https://arxiv.org/







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