Resonance phenomena in macroscopic quantum tunneling for an rf SQUID
Yu. N. Ovchinnikov, P. Silvestrini, V. Corato, S. Rombetto
DOI 10.1103/PhysRevB.71.024529 · Physical Review B
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Abstract
We consider the theoretical problem of resonant phenomena in the macroscopic quantum tunneling for an rf superconducting quantum interference device in the presence of an external irradiating field. The transition probability between different flux states is studied by varying the external parameters of the double-well potential describing the system in a way that the pumping level in the left potential well is close to one of the levels in the right potential well. The dependence of the transition probability on the external drive of the system shows two resonance peaks, the former connected with the resonant tunneling and the latter with the resonant pumping. The relative position of the peaks depends on the pumping frequency ω and on the system parameters.
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