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## Floquet formulation for the investigation of multiphoton quantum interference in a superconducting qubit driven by a strong ac fieldSang-Kil Son, Siyuan Han, and Shih-I Chu Phys. Rev. A 79, 032301 (2009)[BibTeX][pdf]doi:10.1103/PhysRevA.79.032301 We present a Floquet treatment of multiphoton quantum interference in a strongly driven superconducting flux qubit. The periodically time-dependent Schrödinger equation can be reduced to an equivalent time-independent infinite-dimensional Floquet matrix eigenvalue problem. For resonant or nearly resonant multiphoton transitions, we extend the generalized Van Vleck (GVV) nearly degenerate high-order perturbation theory for the treatment of the Floquet Hamiltonian, allowing the reduction of the infinite-dimensional Floquet matrix to an Tags: Floquet, qubit, SQUID, two-level, quantum interference, strong-field, RWA, GVV, KU |

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