Rigetti Computing Inc News
Rigetti Computing Inc. has formally announced the general availability of its most potent system to date, the Cepheus-1-108Q, marking a major achievement for the commercial quantum computing industry. Through the Rigetti Quantum Cloud Services (QCS) platform and Amazon Braket, a worldwide audience of researchers and businesses can now access this 108-qubit quantum computer. This is a significant milestone in the company’s efforts to scale quantum hardware via its proprietary chiplet-based architecture.
A Milestone in Modular Scaling
Rigetti’s modular approach to quantum processor design is critically validated by the debut of Cepheus-1-108Q, which goes beyond simply increasing the number of qubits. Rigetti has developed a multi-chip quantum processor approach, whereas many in the industry struggle with the physical constraints of scaling single-chip processors.
Cepheus-1-108Q has 12 9-qubit chips. Compared to Rigetti’s 2025 flagship, the 36-qubit Cepheus-1-36Q, the modular design triples qubits and chiplets. Tile small, high-performance quantum devices instead of monolithic manufacture, says Rigetti.
“Cepheus-1-108Q validates our ambitious quantum computer scaling strategy,” said Rigetti CEO Dr. Subodh Kulkarni. “Paving the way toward higher fidelity, higher qubit systems that will ultimately enable fault-tolerant quantum computing” is what he said this architecture represents.
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Performance Benchmarks and Speed Advantages
The Cepheus-1-108Q is producing competitive performance numbers all around, despite its size. At present, the system has a median single-gate fidelity of 99.9% and a median two-qubit gate fidelity of 99.1%. Executing the intricate, “wider and deeper” circuits needed for advanced research depends on these fidelities.
Rigetti’s superconducting qubit modality’s industry-leading speed is one of its distinguishing features. The Cepheus-1-108Q can attain gate speeds of about 60 nanoseconds. As a result, Rigetti’s systems are between 1,000 and 10,000 times faster than rival quantum modalities with far slower gate operations, including trapped-ion or neutral-atom systems. A key component of Rigetti’s value proposition is this speed advantage, which enables more operations to be completed in the qubits’ constrained “coherence time.”
Deepening the AWS Partnership
The addition of the 108-qubit system to Amazon Braket strengthens Rigetti’s collaboration with AWS. The first gate-based device on the platform to exceed 100 qubits is Cepheus-1-108Q, launched by Braket with Rigetti.
The significance of this addition for customers around the world was emphasized by Eric Kessler, General Manager of Amazon Braket. “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,” Kessler announced. Prior Rigetti generations on the platform, such as the Aspen and Ankaa series, are followed by the system.
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Engineering Innovations and Fabrication
Several significant engineering developments made at Rigetti’s in-house production facility, Fab-1 the first dedicated and integrated quantum device factory in the industry are credited with the technological success of the 108-qubit system.
Important technical points are as follows:
- Enhanced Qubit and Coupler Design: Optimized chip designs that enable quicker two-qubit gates are known as enhanced Qubit and Coupler Design.
- Advanced Fabrication: The application of a “Alternating-Bias Assisted Annealing” method that enhances qubit frequency targeting and lowers flaws.
- Upgraded Control Electronics: A recently developed system that offers a better signal-to-noise ratio for more precise qubit readout.
- CZ Gates for Error Correction: High-fidelity native gates that are required for quantum error correction are supported by the system. Using a patented adiabatic CZ gate method, Rigetti has notably achieved two-qubit gate fidelities as high as 99.9% at 28 nanoseconds on prototype devices; these findings are being applied to the Cepheus-1-108Q.
The coupling interactions between tunable couplers, which frequently become problematic as a system scales above 100 qubits, were also effectively reduced by Rigetti engineers during development. Due to this improvement, coherence time an area the business is currently focusing on through advancements in materials science has become the main performance constraint instead of coupler behavior.
Quantum Advantage by 2029?
Rigetti’s 2026 proposal is grand. Improving the Cepheus-1-108Q could help the business reach 99.5% median two-qubit gate fidelity later this year.
It expects to alter its long-term technology roadmap in 2026. This update should detail Rigetti’s three-year quantum advantage path.
Rigetti continues to provide a variety of solutions as the industry shifts toward practical, large-scale applications, such as on-premises systems for national laboratories that range in size from 9 to 108 qubits and the Novera QPU, a 9-qubit processor intended for integration into a customer’s current cryogenic infrastructure. With the introduction of Cepheus-1-108Q, Rigetti has firmly established itself as a front-runner in the competition to develop high-performance, scalable quantum hardware.
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