“Two-photon probe of the Jaynes-Cummings model and symmetry breaking in circuit QED”

Two-photon probe of the Jaynes-Cummings model and symmetry breaking in circuit QED.
F. Deppe, M. Mariantoni, E. P. Menzel, A. Marx, S. Saito, K. Kakuyanagi, H. Tanaka, T. Meno, K. Semba, T. Takayanagi, E. Solano, and R. Gross. Nature Physics 4, 686 (2008).