stabilizer-qec
A surface-code simulator and decoder written in Rust, with Python bindings.
- Circuits and detector error models in Stim's text formats, and error models built by walking a circuit backwards, identical to Stim's on every circuit checked.
- Exact minimum-weight matching by sparse blossom, and correlated matching, agreeing with PyMatching shot for shot except for ties.
- A bit-parallel sampler, 64 shots per machine word, that runs
REPEATblocks without flattening. - Raw measurements to detection events, reproducing Google's Willow and Sycamore files bit for bit.
- Sliding and parallel window decoders for real-time decoding.
- Belief propagation reproducing the
ldpclibrary's arithmetic bit for bit, and belief-matching equal to thebeliefmatchingpackage's. - BP+OSD (OSD-0, OSD-E, OSD-CS), whose corrections equal
ldpc'sBpOsdDecoder's, and IBM's bivariate bicycle codes: the gross code [[144, 12, 12]] and [[72, 12, 6]], with the depth-8 syndrome cycle of Bravyi et al. (Nature 627, 778, 2024). - On the gross code, every automorphism's action on the logical qubits, and the gauging measurement of a logical operator as a circuit, its error model equal to Stim's.
- Stim's whole circuit language (every gate, all three bases,
MPP,SPP, correlated and heralded noise, measurement feedback, instruction tags, Pauli-target observables), checked against Stim on random circuits that use every gate. - Lattice surgery as single circuits, their error models equal to Stim's: Z⊗Z and X⊗X merges, a logical CNOT, merges in a row, and lines of patches merged at once.
- A sinter adapter for threshold sweeps, and objects that
pickle for
multiprocessing.
import stabilizer_qec as sq
circuit = sq.memory_circuit(distance=5, rounds=5, p=0.004) # a d = 5 SD6 memory
dets, obs = circuit.compile_detector_sampler(seed=1).sample(100_000, separate_observables=True, threads=0)
dem = circuit.detector_error_model(decompose_errors=True)
pred = sq.Matching(dem, enable_correlations=True).decode_batch(dets, threads=0)
print((pred != obs).any(axis=1).mean()) # logical error rate
The gross code, decoded by BP+OSD:
gross = sq.BivariateBicycleCode("gross") # [[144, 12, 12]], 12 cycles
c = gross.memory_circuit(12, 0.003)
dets, obs = c.compile_detector_sampler(seed=2).sample(2_000, separate_observables=True)
pred = sq.BpOsd(c.detector_error_model()).decode_batch(dets, threads=0)
print((pred != obs).any(axis=1).mean()) # any of the 12 logicals wrong
In sinter's sweeps (pip install "stabilizer-qec[sinter]"):
import sinter
from stabilizer_qec import sinter as sq_sinter
stats = sinter.collect(tasks=tasks, decoders=["sq_matching", "sq_belief_matching", "pymatching"],
custom_decoders=sq_sinter.sinter_decoders(), num_workers=8, max_shots=100_000)
The names follow Stim (Circuit, compile_detector_sampler, separate_observables),
PyMatching (Matching, decode_batch, enable_correlations) and ldpc (BpDecoder,
BpOsdDecoder, error_channel). A seed gives the same shots on any machine and thread count.
See the changelog.
The explainer, its figures running the engine in the browser, is at https://qcompiler.jaspersands.com, with a technical report. The source and the full write-up are at https://github.com/Jaspersands/quantum-simulator-qec.
1 maintainer
Metadata
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Release files for stabilizer-qec 1.5.0
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