Qubit

|ψ⟩ = cosθ|0⟩ + sinθ|1⟩

r = cos(2θ)

P(0) = cos²θ = (1+r)/2
P(1) = sin²θ = (1-r)/2

T = |sin(2θ)|

r² + T² = 1

C₂² + T² = 1

C₃² + αT² - βτ² = α

Cₙ² + Σ_{k=2}^{n} sₖ wₖ Qₖ(θ)² = W₀

f(x) = w₀ + Σᵢ wᵢ xᵢ + Σ_{ij} w_{ij} xᵢ xⱼ + ⋯ + w_{12⋯n} x₁ x₂ ⋯ xₙ

F(θ) = A₁ z + A₂ z² + A₃ z³ + ⋯ + Aₙ zⁿ

h̃⁽ˡ⁺¹⁾ = W⁽ˡ⁾h⁽ˡ⁾ + b⁽ˡ⁾

s⁽ˡ⁺¹⁾_raw = normalize(h̃⁽ˡ⁺¹⁾)

Δ⁽ˡ⁺¹⁾ⱼ = Σᵢ J⁽ˡ⁾ᵢⱼ s⁽ˡ⁾ᵢ s⁽ˡ⁺¹⁾_raw,j

ĥ⁽ˡ⁺¹⁾ = h̃⁽ˡ⁺¹⁾ + λ⁽ˡ⁾Δ⁽ˡ⁺¹⁾