Throughput Efficiency

Throughput Efficiency is the fraction of a quantum system's physical qubits that effectively meet PulseCore validation standards, the effective qubit count divided by the physical qubit count. It is the book's summary measure in its benchmarking of current platforms. The effective count weights each physical qubit by its validation score and operational availability, so throughput efficiency shows how much of a machine is usable for recursive quantum computation. The book's table gives IBM Eagle 8 of 127 qubits (0.063), Google Sycamore 12 of 70 (0.171) and IonQ Forte 28 of 32 (0.875), against a PulseCore target of at least 10⁴ effective out of at least 10⁵ physical qubits, an efficiency of at least 0.1, with coherence times of at least 10³ μs and two-qubit fidelity of at least 0.999. η⥂ = N⊹ / N⚛⊡, where η⥂ is the throughput efficiency, N⊹ is the effective qubit count and N⚛⊡ is the physical qubit count. All are [∅]. It is computed from the Effective Qubit Count and connects to Gap Analysis, Quality Metrics, the Overall Validation Score and the PulseCore Validation Framework.