Fig. 2: Characterizing the dynamical cross-Kerr entanglement.
From: High-fidelity qutrit entangling gates for superconducting circuits
a To study the accumulation of entangling phases under the driven cross-Kerr interaction, we place two qutrits in a full superposition using ternary Hadamard gates (virtual Z gates ommited in diagram), then study the evolution under the Stark drive scheme by performing state tomography. b We demonstrate fitting the accumulation of entangling phase found by tomography to our linear, driven cross-Kerr model, where αij is the slope of the line and the uncertainty is from the linear fit. c, d, We match the behavior of the cross-Kerr entanglement given relevant experimental parameters in our system to our Hamiltonian model for the relative phase of the driving, ϕ, and amplitude of the driving, fixing Ω = Ωa = Ωb. e We additionally compare the dependence of α12 on the frequency of the drive ωd using an ab-initio master equation simulation in QuTiP56,57.
