Line Plot from Scientific Research

Phonon nonlinearity extracted using the method shown in a for different qubitphonon detunings a and probe amplitudes (orange points), compared with the results obtained from the exact diagonalization of equation ( 1 ) without drives (blue dashed line) and to the analytical expression obtained from perturbation theory ${g}^{4}/{}_{a}^{3}$ (black line; Supplementary Information provides details). The error bars are one standard deviation error on the fit nonlinearity parameter.

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