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The dynamical behavior of a superconducting quantum interference device (arf-SQUID) irradiated by a single mode quantized electromagnetic field istheoretically investigated. Treating the SQUID as a flux qubit, we analyze thedynamics of the combined system within the low lying energy Hilbert subspaceboth in the asymmetric and in the symmetric SQUID potential configurations. Weshow that the temporal evolution of the system is dominated by an oscillatorybehavior characterized by more than one, generally speaking, incommensurableRabi frequencies whose expressions are explicitly given. We find that theexternal parameters may fixed in such a way to realize a control on thedynamical replay of the total system which, for instance, may be forced toexhibit a periodic evolution accompanied by the occurrence of an oscillatorydisappearance of entanglement between the two subsystems. We demonstrate thepossibility of generating quantum maximally entangled superpositions of the twomacroscopically distinguishable states describing clockwise andcounterclockwise supercurrents in the loop. The experimental feasibility of ourproposal is briefly discussed.Comment: 16 pages, 7 figures, submitted to PR

physical review. b, condensed matter

Quantum superpositions of clockwise and counterclockwise supercurrent states in the dynamics of an rf-SQUID exposed to a quantized electromagnetic field