Four free, interactive tools that take QEC out of the papers and into your browser. No install. No login. Just the physics, made tangible.
Each tool isolates a core concept in quantum error correction — from noise thresholds to spacetime decoding to the MWPM algorithm to lattice surgery.
Errors in a quantum computer don't just happen in space — they persist through time. This tool renders the full 3D spacetime volume that modern decoders like Harmony and Sparse Blossom actually operate on. Inject errors, watch worldlines form, toggle decoder matching overlays.
Minimum Weight Perfect Matching is the algorithm running inside almost every serious surface code experiment today. This tool slows it down to human speed. Inject X errors, watch the defect graph form, see every matching evaluated, and get a verdict: corrected or logical error.
The fault-tolerance threshold is the single most important number in QEC. Drag the noise slider below it and watch logical error rates collapse exponentially with each concatenation level. Push above it and watch them explode. The threshold theorem, made visceral.
Transversal gates are a luxury real hardware doesn't have. Google and IBM run their two-qubit logical gates by merging and splitting surface-code patches along their boundaries. Pick initial states for two patches, choose a merge type, and step through the full protocol — ancilla init, stabilizer activation, multi-round measurement, outcome, and split — then see exactly how two of these cycles chain into a full CNOT.
Quantum error correction researcher focused on surface codes, decoding architectures, and fault-tolerant systems.
These tools exist because QEC is one of the most consequential problems in science right now — and almost none of it was visible outside a handful of research groups. That felt wrong.
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