wai-quantum 0.3.33: noisy circuits, and where the digital error model is off #156
2026-10-05
Merge branch 'wai-quantum-uf' into wai-quantum-noisy
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wai-quantum 0.3.33: noisy circuits, and where the digital error model is off
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Every quantum-advantage experiment reports a fidelity measured on noisy hardware. For random-circuit sampling that is a cross-entropy (XEB) estimate, read against a digital error model: the product of every gate's and readout's success probability. quantum_noisy checks that arithmetic: - Trajectories on the state vector: after each gate, one branch of each noise channel on the qubits it touched. Pauli channels (depolarizing, dephasing) stay unitary; amplitude damping jumps with probability gamma P(1) and is renormalised; readout flips each measured bit. Seeded per trajectory and reduced in order, so a run is the same bits at any thread count. - The exact density matrix up to 12 qubits, held as a state on 2n qubits (U (x) U* for a gate, the Kraus sum for a channel), on the same kernels. - linear_xeb (sampled, with a standard error), exact_xeb (the infinite-sample value), ideal_xeb (the circuit's own, 1 when fully scrambling) and digital_fidelity. Checked: - 4,000 trajectories land within four standard errors of the exact expectations, every channel on; sampled bitstrings follow the exact distribution with readout flips; sampled XEB converges to the exact value. - The digital model understates the exact (normalised) XEB of 8-qubit brickwork circuits by 3.5-4.5% at two-qubit error 0.005 and 7-10% at 0.01, and the margin does not grow over 4 to 48 layers: a fixed set of errors near the measurement that the model counts as fatal, not a per-gate bias. On a circuit that does not scramble the gap is wider (0.71 vs 0.60). CLI: wai-quantum noisy --file CIRCUIT.jsonl [noise] [--expect] [--xeb] [--exact] [--json]. Pinned bit for bit natively and under wasm32-wasip2 (18 pins); CLI output byte-identical, threaded or not. Co-Authored-By: Claude Opus 5.5 <[email protected]>