i c ˙ ˙ 1 ( t ) = c 1 ( t ) cos ⁡ ⁡ ( ω ω t ) ℏ ℏ ⟨ ⟨ 1 | e r ⋅ ⋅ E 0 | 1 ⟩ ⟩ + e i ω ω 0 t c 2 ( t ) cos ⁡ ⁡ ( ω ω t ) ℏ ℏ ⟨ ⟨ 1 | e r ⋅ ⋅ E 0 | 2 ⟩ ⟩ i c ˙ ˙ 2 ( t ) = c 2 ( t ) cos ⁡ ⁡ ( ω ω t ) ℏ ℏ ⟨ ⟨ 2 | e r ⋅ ⋅ E 0 | 2 ⟩ ⟩ + e − − i ω ω 0 t c 1 ( t ) cos ⁡ ⁡ ( ω ω t ) ℏ ℏ ⟨ ⟨ 2 | e r ⋅ ⋅ E 0 | 1 ⟩ ⟩