QC Design builds Plaquette, a design-automation software for fault-tolerant quantum computing.

From logical qubit demonstrations to scalable fault-tolerant architectures, we help quantum hardware teams simulate, analyze, and optimize designs under realistic hardware imperfections. Plaquette brings together quantum error-correction codes, decoders, error models, and multiple simulation backends in one workflow, helping teams answer the questions that shape their roadmap: Which architecture is most feasible? Which errors matter most? What thresholds must the hardware reach? And how many physical qubits are needed per logical qubit?

Plaquette supports all major hardware platforms, including superconducting qubits, trapped ions, neutral atoms, photonics, and spin qubits. With support for 20+ real-world imperfections, flexible on-prem deployment, and a broad library of codes and decoders, customers can iterate faster, reduce in-house tooling burden, and keep proprietary IP in-house.

QC Design’s mission is to accelerate the path from today’s imperfect quantum hardware to scalable, useful, fault-tolerant quantum computers.

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