QPE precision: Δφ = 2π/2^t; P_success ≥ 8/π² for exact-t-bit accuracy

Quantum Phase Estimation precision and success probability. From framework F8, reading t ancilla qubits projects onto the nearest 2^t-adic estimate of φ. Standard textbook result (Kitaev; Nielsen & Chuang Thm 5.2): the estimate φ̂…