text: (δϕ2)ω 
  
  (κ/2 + γ*ab*)2 
  *I*0ω2[(κ/2 + γ*ab*)2 + ω2] 
  ≈ 
  + 2*R*[(*A*0 +*B*0) + (*A*2 +*B*2)] 
  +*Rp*[(*C*0 −  *C*∗0)2 + (*C*1 −  *C*∗1)2 + (*C*2 − 
  *C*∗2)2] 
  . 
  } 
  (9) 
  
  Since the time τ and*T*is much shorter than the time scale 
  of the atomic dampings, we can neglect the dampings when 
  calculate*Ai*,*Bi*,*Ci*. By using 
  
  Ω*R*
  2  Ω*R*
  2  τ 
  !  ! 
  
  ∆2 
  2  Ω*R*
  2 
  sin2 (Ω*R*τ) cos2  ,*B*0 = sin2 
  τ 
  ! 
  ,  *T*
  −  ! 
  
  Ω*R*
  2 
  
  ∆2*T*
  ,*B*2 = sin2 (Ω*R*τ) cos2 
  τ 
  ! 
  , 
  2 ! 
  
  (*C*0 − 