For example, the two-qubit state: | Ψ Ψ ⟩ ⟩ = 1 2 2 ( | 00 ⟩ ⟩ + 3 | 01 ⟩ ⟩ + 3 | 10 ⟩ ⟩ + | 11 ⟩ ⟩ ) has the following SD: | Ψ Ψ ⟩ = 3 + 1 2 2 | ϕ ϕ 1 A ϕ ϕ 1 B ⟩ + 3 − − 1 2 2 | ϕ ϕ 2 A ϕ ϕ 2 B ⟩ with | ϕ ϕ 1 A ⟩ ⟩ = 1 2 ( | 0 A ⟩ ⟩ + | 1 A ⟩ ⟩ ) , | ϕ ϕ 1 B ⟩ ⟩ = 1 2 ( | 0 B ⟩ ⟩ + | 1 B ⟩ ⟩ ) , | ϕ ϕ 2 A ⟩ ⟩ = 1 2 ( | 0 A ⟩ ⟩ − − | 1 A ⟩ ⟩ ) , | ϕ ϕ 2 B ⟩ ⟩ = 1 2 ( | 1 B ⟩ ⟩ − − | 0 B ⟩ ⟩ )