Effective Qubit Count

The Effective Qubit Count is the number of qubits a quantum system can actually use, found by weighting each physical qubit by its validation performance and operational availability. The book uses it to replace raw qubit counts with a realistic measure of capability when benchmarking platforms against PulseCore requirements. In its amplification model of computing history, the effective qubit count sets the strength of the quantum breakthrough: in the Recursive Amplification Factor, quantum systems contribute α₄ = 2^(N⊡⊹), so capability grows exponentially with effective, not physical, qubits. The formal statement is N⊹ = Σᵢ₌₁^N⚛⊡ V⊡,i × W⊹,i, where N⚛⊡ is the number of physical qubits, V⊡,i the validation score of qubit i (from 0 to 1) and W⊹,i its operational availability weight. All quantities are dimensionless [∅]; the book's check is consistent. The share of qubits that meet PulseCore standards is the Throughput Efficiency η⥂ = N⊹/N⚛⊡. It connects to Throughput Efficiency, Effective Qubit Utilization, PulseCore Qubit Validation, PulseCore-Validated Qubits, Recursive Amplification Factor and Physical-to-Logical Qubit Ratio.