Figure 4
Fidelities of quantum state transmission.
(a) Fidelities F1 and F2 versus the strength fd of the driving force acting on the Duffing oscillator with p0 = 0.6 and τ = 2π/ω0 as the unit of time. (b) F1, F2 and their average (F1 + F2)/2 versus p0 in the hard-chaotic region, with fd/ω0 = 36. The average fidelity is maximized at p0 = 0.5, which corresponds to |ϕ1〉 = |ϕ2〉.
