Phase-controlled coherent population trapping in superconducting quantum circuits*
Cheng Guang-Linga)†, Wang Yi-Pinga), Chen Ai-Xia),b)‡
       
The steady-state populations | ρ 21|, ρ 11, ρ 22 versus the probe detuning δ 31/γ31. The parameters are chosen as γ32 = γ31, γ21 = 0.01γ31, δ 32 = 0,| Ω 32| = | Ω 31| = 2.5γ31,| Ω 21| = 0.5γ31, ϕ = 0 (a), ϕ = π /2 (b), and ϕ = π (c).