Figure 5
From: Two-qubit quantum gate and entanglement protected by circulant symmetry
(a) Entangled state fidelity state calculated from the numerical simulation of Hamiltonian (19) as a function of ω for various J0. The parameters are set to Ω1/2π = 30 kHz, V0/2π = 2.0 kHz, φ = π/4, and J0/2π = 2.0 kHz (black triangles), J0/2π = 1.8 kHz (blue circles), J0/2π = 1.8 kHz (red squares). (b) The same but now set ω/2π = 0.8 kHz and vary the coupling strength J0.
