wai-quantum-service: the quantum stack as a public job service; wai-quantum 0.6.3: the wide tableau, any-angle MPS, tiled state vectors, branching trajectories, threaded sparse Pauli #297
2026-10-18
Merge main into wai/quantum-service again: every CHANGELOG entry kept
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Co-Authored-By: Claude Opus 5.5 <[email protected]>
Merge main into wai/quantum-service: both CHANGELOG entries kept
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Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum: a word-sized counter for branching trajectories' trees (no 64-bit atomics on some targets)
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The emulated signal-processor leg (a 32-bit target) failed to build: AtomicU64 does not exist there. Checked: cargo check for a 32-bit target without 64-bit atomics passes with the fix and fails without it. Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-10-17
Merge main into wai/quantum-service; the tensor-engine fix joins the 0.6.3 notes
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Co-Authored-By: Claude Opus 5.5 <[email protected]>
Merge the state-vector, trajectory, sparse-Pauli and MPS speed work into wai-quantum 0.6.3
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Folds wai/quantum-sim-speed into this release, so one CI run covers both: tiled state-vector passes, branching noisy trajectories, the sparse-Pauli engine on a worker pool, and the MPS split by Gram eigenvectors, with the service using all four. 0.6.3 is unpublished, so its CHANGELOG entry now describes the whole release. Co-Authored-By: Claude Opus 5.5 <[email protected]>
Merge main into wai/quantum-service
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Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum: MPS two-site split by the Gram eigenvectors (Householder + QL), no division by singular values
Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum: the sparse-Pauli engine on a worker pool, bit-identical at any thread count
Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum: branching noisy trajectories (shots that share a history share a state)
Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum: tiled multi-gate state-vector passes; vectorised wide-gate kernel
Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum 0.6.3: matrix product states at any angle; the service's mps method
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quantum_mpsim (new, in full): a chain in mixed-canonical form, the center moved by QR; each two-qubit gate a two-site update split by the crate's deterministic Jacobi SVD and truncated to max_bond and a cutoff; distant gates routed by swaps. Every truncation is reported (bonds, summed discarded weight, fidelity estimate). Amplitudes, Pauli expectations by transfer matrices, shots by sequential conditional sampling. Untruncated it agrees with the dense state vector to 1e-10; the estimate tracks the true fidelity under truncation. Brickwork depth 10: 100 qubits in 0.46 s, 500 in 2.4 s. The service lowers three-qubit gates to one- and two-qubit ones for it, adds mps (4096 qubits, bond up to 128 under a work estimate) to auto after the exact methods, and labels its results exact or heuristic with the fidelity estimate, warning below 0.9. Live: 300 qubits in 7 ms. Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum 0.6.3: the wide stabilizer tableau; the service's stabilizer method on it
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quantum_tableau (new, in full): Clifford circuits on up to 32768 qubits, the Aaronson-Gottesman tableau packed qubit by qubit with u32 indices. Tableau::support gives the affine subspace the computational-basis outcomes are uniform over (Gaussian elimination with signs tracked); a Sampler draws each shot as a random combination of its basis on the measured qubits. Tableau::expectation gives the exact +-1/0 of a Pauli string from the destabilizers. At 10,000 qubits: 100k gates in 49 ms, the subspace in 353 ms, 1000 full-width shots in 154 ms. Against the dense state vector on 40 random circuits: the outcome set, its uniform probabilities and 800 expectation values agree. The service lowers Clifford circuits to it (quarter-turn rotations, half-turn controlled phases), answers counts and expectations up to 32768 qubits, and caps a counts map's size. Live: a 2000-qubit GHZ with a phase flip reads <X^2000> = -1 in 260 ms. 25 service tests. Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum-service: README and CHANGELOG; live at wai.transaction.science/quantum-jobs/v1
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Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum-service: a big job waits until the host's free memory covers it and the reserve
Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum-service: smoke checks over HTTP, and CI on linux and macos
smoke.sh holds a running instance to its promises (methods, a 40-qubit GHZ by the stabilizer, receipts that verify and a changed result that does not, rotations by the state vector, a 100-qubit circuit's expectations by sparse Pauli dynamics with bounds, a refusal with its reason). CI runs the tests, clippy -D warnings and the smoke checks against a local instance. Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai-quantum-service: a public job service over the WAI quantum stack (work in progress)
An OpenQASM 3 front end (registers, broadcast, user gates, angle expressions, every terminal measurement form) lowered three ways: matrix gates, Pauli rotations, and the dyadic gate set, each held to the others by tests. A planner that picks the strongest method a circuit admits (exact, statevector, stabilizer, pauli, tensor_network, density_matrix, trajectories), with stated accuracy classes. Jobs run in child processes inside a memory budget at low priority; per-client limits and a bounded queue; results sealed with an Ed25519 key. 23 tests pass on Linux. Co-Authored-By: Claude Opus 5.5 <[email protected]>