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Designing Fault-Tolerant
Quantum Computers.

We provide design automation software to help you achieve fault tolerant quantum computing faster and smarter.

Build, simulate, and optimize FTQC architectures Design logical qubit experiments with confidence Overcome 20+ imperfections on real hardware
Discover Plaquette

Designing for fault-tolerance

Achieve fault-tolerant quantum computing faster and smarter

Introducing Plaquette — the ultimate design software crafted for quantum hardware teams.

QC Design video thumbnail
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Powerful fault-tolerance design software is necessary to achieve fault-tolerant quantum computing. It enables the implementation of logical circuits on hardware and the design of fault-tolerance architectures, both of which are critical but challenging tasks.

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Building and maintaining in-house tools leads to delays, higher costs, and missed opportunities. Many hardware teams attempt to develop their own solutions, but these efforts often divert valuable resources away from core innovation.

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Plaquette simplifies fault-tolerance design, freeing your architects and researchers to focus on innovation rather than software development. Accelerate your R&D, reduce resource strain, and stay focused on solving the toughest challenges in fault-tolerance with Plaquette.

Why hardware teams choose Plaquette

Build for reality, not just theory

Get Actionable Insights for Real Hardware

Make design decisions with confidence by understanding how 20+ real-world imperfections, from leakage to overrotation, impact your logical qubits.

Accelerate Your Path to Fault Tolerance

Run complex simulations and generate threshold plots in hours, not weeks, enabling rapid design iteration to stay ahead of the competition.

Reduce Costs and Stay Focused

Avoid expensive in-house fault-tolerance software, freeing your experts to innovate on hardware while cutting R&D costs and risks.

Trusted by industry leaders

Hear from our customers

The Plaquette photonics offering helps us design fault-tolerant architectures that are tailored for our hardware platform. And it does this at a small fraction of the cost of building and maintaining the software in-house. QuiX Quantum Logo

Pim Venderbosch, head of software at QuiX Quantum, Europe's market leader in photonic quantum computing.

By adopting Plaquette to efficiently implement and optimize quantum error correction routines within our unique NFQC architecture, we can accelerate the path toward fault-tolerant performance and unlock early, meaningful real-world use cases. Qudora Logo

Dr. Amado Bautista-Salvador, CEO of QUDORA.

Plaquette gives us a systematic, end‑to‑end way to test fault‑tolerance protocols ahead of hardware, identify the biggest performance levers early, and move faster with higher confidence. ZuriQ Logo

Dr. Pavel Hrmo, CEO of ZuriQ.

Plaquette's ability to model over 20 hardware imperfections gives us valuable insights into refining our atom-photon architecture. This level of precision, combined with QC Design's expertise, provides us with a competitive advantage in developing quantum computers. Quantum Source Logo

Dr. Michael Slutsky, Head of Theory Group at Quantum Source.

PLAQUETTE

The Essential Tool for Quantum Hardware Teams

Clifford and beyond-Clifford simulators for accurate modelling
Vast library of fault-tolerance codes and decoders
Extensive error model library for all platforms or specify own
Flexible on-premises deployment for maximum IP protection
Comprehensive tutorials and documentation for seamless onboarding
User-friendly interface designed for accessibility and depth
Capability to conduct experiments on actual quantum hardware
Responsive customer support with experts in fault tolerance
Learn more

Frequently Asked Questions

Who is Plaquette for?

Plaquette is built for quantum hardware teams working on logical circuit demonstrations and on fault-tolerance architectures. This includes not only fault-tolerance theorists but also hardware engineers who are looking to simulate, analyze, and optimize fault-tolerance designs.

What makes Plaquette different from Stim?

Stim is a fast simulator for Clifford circuits, designed as an assembly language. By analogy, Plaquette is a user-friendly IDE offering libraries of error correction codes, error models, several decoders, and multiple backends, including Stim. Plaquette includes over 5 additional backends that accurately model imperfections that Clifford simulators miss, such as leakage, failed fusions and coherent errors.

When should I consider using Plaquette instead of combining open source packages?

Plaquette is built for hardware efforts like demonstrating logical qubits and devising fault-tolerance architectures. You should use Plaquette if you're looking to:

  • Quickly simulate and optimize fault-tolerant designs without the costs of maintaining custom-built software.
  • Accurately model various hardware imperfections—such as leakage and overrotation—that Clifford simulators miss.
  • Access extensive libraries of quantum error-correction codes, decoders, and error models tailored for your hardware platforms.
  • Free your team to focus on core innovation instead of software development.
Which hardware platforms does Plaquette support?

Plaquette is designed to work with any of the major quantum hardware platforms. We enable matter-based qubit simulations via circuit-based quantum computing (CBQC) and photonics-based qubit simulations via measurement- or fusion-based approaches (MBQC, FBQC). Thanks to this framework, Plaquette supports all of the major hardware platforms including superconducting qubits, neutral atoms, trapped ions, and photonic systems.

Which hardware imperfections can Plaquette's simulators handle?

Plaquette can simulate a wide range of hardware imperfections, including those most critical for various hardware platforms, such as (in no particular order):

  • Photonic systems: e.g., fusion failures, imperfections in single-photon sources and detectors.
  • Superconducting qubits: including transmons and bosonic qubits (e.g., two-qubit gate imperfections, leakage).
  • Neutral atoms: e.g., errors from measurements, scattering, leakage, over- and under-rotation.
  • Trapped ions: e.g., errors from over- and under-rotation, heating of motional modes.
  • Spin qubits: e.g., charge noise, fabrication defects.
How can I specify error models in Plaquette?

You can mix-and-match built-in or user-defined error models. Plaquette's simulator backends support specifying realistic hardware imperfections through Kraus operators or propagators acting on the computational subspace of the qubits and, optionally, higher energy levels. Alternatively, you can define error models via a Hamiltonian describing gate operations and Lindblad operators describing error processes. This framework allows analysing the effects of leakage, photon loss, shuttling errors, intermediate state scattering, over- and under-rotation, and other significant noise models. All Plaquette simulators support these error models with varying accuracy and performance.

Which quantum error-correction codes does Plaquette support?

Plaquette provides an extensive library of quantum error-correction codes, including:

  • Surface codes: such as the planar surface code, rotated planar surface code, toric code, and subsystem surface code.
  • LDPC codes: including Hypergraph Product (HGP) codes, Bivariate Bicycle (BB) codes, Generalized Bicycle (GB) codes, and Lifted Product (LP) codes.
  • Other fundamental codes: such as the Bacon-Shor code, Steane code, Five-qubit code, and Repetition codes.
  • Photonic codes: including foliated versions of any of the above codes for measurement-based quantum computing (MBQC), and specific fusion networks such as Four-star fusion networks (open and periodic boundaries) and Six-ring fusion networks (open and periodic boundaries) for fusion-based quantum computing (FBQC).

Additionally, you can also define custom codes by specifying stabilizer generators and logical operators, allowing you to use Plaquette's circuit generation, simulation, and decoding capabilities to design your own fault-tolerant architectures. We continuously add new codes as they emerge in research literature.

Is Plaquette available for local installation?

Yes! Plaquette is provided as downloadable on-premises software that can be installed directly on your local devices, such as laptops or private cloud infrastructure.

Do I need to share my proprietary data or device designs with QC Design?

No. Plaquette is offered as an on-premises installation on your laptops or private cloud, allowing you to run sensitive simulations internally and maintain full confidentiality of your designs. There is no need to share any proprietary IP, including error-correction codes, decoders, error models, or compilation methods.

What kind of support is available?

As a Plaquette subscriber, you receive support from our dedicated team, composed of leading global experts in fault tolerant quantum computing. Our customers consistently praise our team for responsiveness.

Does Plaquette require advanced expertise in fault tolerance to use?

No advanced expertise is required to get started. Customers frequently find Plaquette's extensive documentation to be an approachable way to quickly reach the cutting edge of quantum fault tolerance—more accessible than primary research literature and more practical than review articles.

I have more questions—how can I contact you?

We'd love to chat! You can schedule a call using our Calendly link or write to us using the contact form.

A Team of Quantum Pioneers at Your Side

QC Design Team

Founders and Board

Dr. Ish Dhand

Dr. Ish Dhand

CEO

Dr. Shreya P Kumar

Dr. Shreya P Kumar

CTO

Prof. Martin B Plenio

Prof. Martin B Plenio

Scientific advisor

Dr. Lise Rechsteiner

Dr. Lise Rechsteiner

Board member

Investors & Public Funding