Quantum Error Correction Architecture
Closing the QEC loop from cloud to near-QPU controllers
Qcraft Cloud selects codes and optimizes circuits. The FPGA near the QPU runs two modules: M1 (decoder) for digital QEC and M2 (autonomous cooler) for continuous CKL enforcement — handling not just Pauli errors, but leakage, coherent over-rotations, ZZ crosstalk, and burst noise.
Firmware-in-the-Loop Simulation
It Works — Across the Full Noise Spectrum
Tested across 7 distinct noise profiles over 30–70 QEC rounds. Not shallow-circuit cherry-picks — sustained performance under realistic conditions.
99.9% Sustained Fidelity
Over 70 QEC rounds, code distance 7
With autonomous cooling, fidelity improves monotonically as code distance increases. Standard QEC alone can actually get worse at intermediate distances under realistic noise.
100% Safety Compliance
Zero violations across 10,000 rounds
The cooling protocol satisfies all safety conditions at every cycle. Adaptive cooling recovers from burst errors in 3 rounds or fewer, consuming 70% less power than always-on cooling.
Why Autonomous Cooling
Standard QEC isn’t enough
Quantum hardware doesn’t just produce simple bit-flip errors. Real processors suffer from 5 distinct error types that standard QEC ignores — and they accumulate fast. Our cooling handles all of them.
QEC Alone Can Degrade Performance
At intermediate code distances, adding more QEC qubits actually hurts fidelity for real-world noise. Standard correction only handles simple bit-flips — other errors slip through and compound.
Cooling Suppresses All Error Types
Autonomous cooling runs between QEC rounds — continuously draining errors before they accumulate. It restores fidelity across all noise types, not just Pauli.
Same Fidelity, Smaller Code Distance
Because cooling boosts fidelity at every code distance, you can use a smaller code to reach the same logical error rate — saving thousands of physical qubits.
Continuous, Not Batch Correction
Standard QEC waits for a full round of measurement, decoding, then correction. Our cooling suppresses errors continuously during idle periods — no waiting, no latency bottleneck.
Broad-Spectrum Results
Works Across All 7 Noise Profiles
Fidelity improvement from adding autonomous cooling to QEC at code distance 5, sustained over 50 rounds. Higher is better.
All results from firmware-in-the-loop simulation. Even the “easy” noise types (Pauli, leakage) hit 99.9% with cooling.
Building fault-tolerant quantum computing
Smaller code distance. Same fidelity. Fewer qubits. Explore our autonomous cooling framework.