Validation Threshold

The Validation Threshold is the certification bar a qubit's Overall Validation Score must reach, V⨶ = 0.999, set extremely high so that only qubits capable of sustained recursive operation qualify for PulseCore validation. It completes the PulseCore Validation Framework: coherence, entanglement, gate accuracy, measurement precision and substrate phase alignment are combined in the validation score, and the threshold decides certification. The book then singles out the alignment factor as different from the other four laboratory quantities: because an advancing phase difference is indistinguishable from a rotation, F⇉ is already a spin measurement, and since every leading platform encodes its two states in something that spins, a qubit is spin-½ in engineering form. The spin floor of Z.11 therefore applies to qubits: no qubit can be sustained by fewer than s²/2 substrate cells acting coherently, N▫ ≥ s²/2 ≈ 2.787 × 10¹²⁴. V⊡ ≥ V⨶ = 0.999, where V⊡ is the overall validation score and V⨶ is the validation threshold for PulseCore certification. Both are [∅]. It applies to the Overall Validation Score within the PulseCore Validation Framework, certifies PulseCore-Validated Qubits, and connects to Spin Angular Momentum and Complete Computational Cycle.