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Letter

Nature Physics 4, 686–691 (1 September 2008) | doi:10.1038/nphys1016

Two-photon probe of the Jaynes|[ndash]|Cummings model and controlled symmetry breaking in circuit QED

Frank Deppe , Matteo Mariantoni , E. P. Menzel , A. Marx , S. Saito , K. Kakuyanagi , H. Tanaka , T. Meno , K. Semba , H. Takayanagi , E. Solano & R. Gross

Superconducting qubits behave as artificial two-level atoms and are used to investigate fundamental quantum phenomena. In this context, the study of multiphoton excitations occupies an important role.