Figure 3

Time evolution of the concurrence given by threes models.

Time evolution of the concurrence calculated by (a) TC2, (b) HEOM and (c) TL2 for different values of λ at temperatures T = 300 K (black), 250 K (red) and 200 K (blue). The other parameters are ω₀ = 70 cm⁻¹, J = 100 cm⁻¹ and γ = 50 cm⁻¹ (γ⁻¹ = 106 fs). In general, the concurrence will die out faster for larger λ and higher temperatures. The coherence over-estimation of the TC2 method is manifested by a concurrence revival around 100 fs for larger values of λ, whereas HEOM and TL2 produce a monotonically-decreasing concurrence.