Rigetti Unveils 108-Qubit Quantum Computing System

Cepheus-1-108Q is the industry's largest modular quantum computer, leveraging Rigetti's proprietary chiplet architecture.

Apr. 7, 2026 at 8:05pm

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A highly detailed, glowing 3D macro illustration of the internal components and circuitry of a powerful quantum computing system, with recognizable physical elements like superconducting qubits and interconnected chiplets illuminated in a vibrant neon color palette, conveying the advanced, high-tech nature of this quantum computing breakthrough.Rigetti's new 108-qubit quantum system represents a significant step forward in scaling up the power and capabilities of practical quantum computing.Berkeley Today

Rigetti Computing has announced the general availability of its 108-qubit quantum computing system, Cepheus-1-108Q, which is now accessible to customers and partners through the Rigetti Quantum Cloud Services (QCS) Platform and Amazon Braket. The new system features several key technical advancements, including enhanced qubit and coupler design, support for high-fidelity CZ gates, upgraded control electronics, and an advanced fabrication process.

Why it matters

Rigetti's 108-qubit system represents a major milestone in the company's ambitious approach to scaling quantum computers. The innovations developed for this system, including the proprietary chiplet-based architecture, are expected to enable higher fidelity and higher qubit count systems that could ultimately pave the way for fault-tolerant quantum computing.

The details

Cepheus-1-108Q comprises twelve interconnected 9-qubit chiplets, tripling the number of qubits and chiplets from Rigetti's previous 36-qubit system. The system is currently performing at a 99.1% median two-qubit gate fidelity with a gate speed of ~60 ns and a 99.9% median single-gate fidelity. Rigetti plans to continue improving the fidelity of the individual chiplets, with the goal of reaching a median 99.5% two-qubit gate fidelity later this year.

  • Rigetti announced the general availability of Cepheus-1-108Q on April 7, 2026.
  • Rigetti intends to update its technology roadmap later this year, once it has incorporated the results of its work on improving the system's fidelity.

The players

Rigetti Computing, Inc.

A pioneer in full-stack quantum computing, Rigetti operates quantum computers over the cloud through its Rigetti Quantum Cloud Services (QCS) platform.

Dr. Subodh Kulkarni

The CEO of Rigetti Computing.

Eric Kessler

The General Manager of Amazon Braket, the quantum computing service by AWS.

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What they’re saying

“Cepheus-1-108Q is a milestone that validates our ambitious approach to scaling quantum computers. Our proprietary chiplet-based architecture is paving the way toward higher fidelity, higher qubit systems that will ultimately enable fault-tolerant quantum computing.”

— Dr. Subodh Kulkarni, CEO, Rigetti Computing

“The addition of Cepheus-1-108Q to Amazon Braket gives our global customers another choice as they research quantum computing applications in materials science, optimization, and quantum simulation. As the first gate-based device on Braket with over 100 qubits, Cepheus-1-108Q delivers improved fidelities that allow customers to push to wider and deeper circuits.”

— Eric Kessler, General Manager, Amazon Braket

What’s next

Rigetti plans to continue to improve the fidelity of the individual chiplets in Cepheus-1-108Q, with the goal of reaching a median 99.5% two-qubit gate fidelity later this year.

The takeaway

Rigetti's 108-qubit quantum computing system represents a significant milestone in the company's efforts to scale quantum computing through its proprietary chiplet-based architecture, paving the way for even more powerful and reliable quantum systems in the future.