Physics – Quantum Physics
Scientific paper
2010-03-08
Physics
Quantum Physics
10 pages, 6 figures
Scientific paper
In contrast to natural atoms, the potential wells for superconducting flux qubit (SFQ) circuits can be artificially controlled. When the inversion symmetry of the potential energy is broken, it is found that the multi-photon processes can coexist in the multi-level SFQ circuits. Moreover, there are not only transverse but also longitudinal couplings between the external magnetic fields and the SFQs with the broken inversion symmetry. The longitudinal coupling would induce some new phenomena in the SFQs. Here we show that the longitudinal coupling can result in the coexistence of multi-photon processes in the SFQs in analogue to the multi-level SFQ circuits. We also show that the SFQs can become transparent to the transverse coupling fields when the longitudinal coupling fields satisfy the certain conditions. We further show that the quantum Zeno effect can also be induced by the longitudinal coupling in the SFQs. Finally we clarify why the longitudinal coupling can induce coexistence and disappearance of single- and two-photon processes for a driven SFQ, which is coupled to a single-mode quantized field.
Liu Yu-xi
Wang Xiang-Bin
Yang Cheng-Xi
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