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wai-quantum 0.3.33: noisy circuits, and where the digital error model is off
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]>
2026-10-05 08:08:06 -04:00
..
data wai-quantum 0.3.30: qLDPC memory at circuit level, re-derived from the circuit up 2026-10-04 21:30:40 -04:00
bit_identity.rs wai-quantum 0.3.33: noisy circuits, and where the digital error model is off 2026-10-05 08:08:06 -04:00
frame_reference.rs wai-quantum 0.3.25: error correction at circuit level, sampled, modelled and decoded exactly 2026-10-04 14:21:56 -04:00
tn_vs_sv.rs wai-quantum 0.3.28: the dense state vector at any angle, the same bits threaded or not 2026-10-04 17:01:39 -04:00
utility_reference.rs wai-quantum 0.3.23: belief-propagation tensor networks, a second method for the same circuits 2026-10-01 20:40:14 -04:00