Fig. 5: Two strategies for photon number calibration.
From: Fast generation of Schrödinger cat states using a Kerr-tunable superconducting resonator
a Qubit spectroscopy under different pump pulse amplitudes. b Poisson fitting with an average photon number 1.92. c Linear relationship between displacement and pump amplitude. d Wigner function of a coherent state with α = 1.42. e Fitting of Wigner function (dashed gray line in (d)).
