Quantum Error Correction · Interactive Visualizers

Making quantum error
correction
visible

Three free, interactive tools that take QEC out of the papers and into your browser. No install. No login. Just the physics, made tangible.

Explore the tools → Open 3D Spacetime ↗
3
interactive tools
free
no login needed
live
in your browser
QEC
surface codes
The Suite

Three tools. One field.

Each tool isolates a core concept in quantum error correction — from noise thresholds to spacetime decoding to the MWPM algorithm.

TOOL 01 ── SPACETIME
Syndrome History &
Spacetime Visualizer

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.

3D interactive defect worldlines T = 6 rounds Harmony / Sparse Blossom
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TOOL 02 ── DECODER
MWPM Decoder
Visualizer

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.

step-by-step defect graph 5×5 patch logical error detection
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TOOL 03 ── THRESHOLD
Concatenated Code
Explorer

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.

[[3,1,3]] code up to level 5 threshold slider exponential suppression
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Built by
Niharika Verma

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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Surface codes — the leading architecture for fault-tolerant quantum computing, used by Google, IBM, and Microsoft.
MWPM decoding — the algorithm that reads syndrome measurements and infers corrections in microseconds on real hardware.
Spacetime decoding — the 3D framework that lets decoders distinguish data errors from measurement faults across rounds.
The threshold theorem — below a critical noise rate, arbitrary computation becomes possible with growing code distance.