Rigetti Computing Declares 108-Qubit Cepheus System Strategic Timeline Update
Cepheus-1-108Q
Rigetti Computing, Inc., a pioneer in full-stack quantum-classical computing research, has updated its technical roadmap and changed the projected launch timeframe for its eagerly awaited Cepheus-1-108Q system. The 108-qubit quantum computing device is now expected to go on sale by the end of the first quarter of 2026, the Berkeley-based company confirmed. The company’s emphasis on fulfilling strict performance standards and guaranteeing the dependability of its biggest modular system to date is reflected in this change.
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Optimizing Performance with High Fidelity
Rigetti’s dedication to reaching a certain performance criterion, a 99.5% median two-qubit gate fidelity, led to the decision to modify the roadmap. Although the company is making “strong progress,” CEO Dr. Subodh Kulkarni says the company has chosen to spend more time testing and enhancing the system to make sure it satisfies internal requirements.
With a 99% median two-qubit gate integrity on the 108-qubit system, Rigetti has already produced noteworthy results across its existing fleet. Smaller-scale systems from the business exhibit even greater precision, with the 36-qubit system attaining 99.6% and the 9-qubit system reaching 99.7%. These numbers highlight a larger industry problem: sustaining high fidelity gets exponentially more difficult as qubit counts rise.
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Technical Challenges: Chip Evolution and Flexible Connections
New engineering challenges have been brought about by the switch to 108 qubits. Building systems with more qubits frequently reveals special difficulties, according to Dr. Kulkarni, who especially mentioned difficulties with adjustable couplers. Rigetti has chosen to run a new version of their microprocessor in order to resolve these problems and enhance system fidelity even more.
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Modular Architecture’s Strength
Instead of being a single, monolithic processor, the Cepheus-1-108Q is constructed using Rigetti’s exclusive modular chip design. The system is made out of twelve tiled 9-qubit chiplets. The core of Rigetti’s scaling technique is this modular approach. In 2025, the Cepheus-1-36Q, which made use of four 9-qubit chiplets, was deployed, marking the first successful large-scale demonstration of it.
Rigetti creates the biggest modular quantum computing system on the market by utilizing this multi-chip technology. The company’s specialized Fab-1 facility, the first integrated quantum device production factory in the industry, can produce smaller, high-performance “chiplets” with its design, which can then be assembled into larger processors.
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Speed and Competitive Advantage
Rigetti is still a strong supporter of superconducting qubits, which it views as the most promising modality with its maturity and obvious scaling route. Speed is one of this technology’s main benefits. According to the business, current Rigetti systems achieve gate speeds of 50–70ns, which is around 1,000 times quicker than other modalities like ion traps or neutral atoms.
This speed is essential for “full-stack” performance, which allows for tighter interaction with traditional computing infrastructure and faster execution of quantum algorithms. The company’s patented quantum-classical architecture supports useful R&D for international industry and government clients by offering high-performance integration with both public and private clouds.
Availability and Market Supply
Even after the 108-qubit system’s timetable was changed, Rigetti still provides services to a wide variety of clients. The Rigetti Quantum Cloud Services (QCS) platform, which enables remote access for research and development, is used by the company to run its hardware.
To assist national labs and specialized quantum computing centers, Rigetti also provides on-premises systems with 9–108 qubits. Targeting the larger R&D community, their 9-qubit Novera QPU is positioned as a high-performance device that can be included into a client’s current control and cryogenic systems.
Looking Ahead
Rigetti confronts a number of typical sector risks as it works toward the new Q1 2026 objective, including as supply chain stability and inflation, government contracts, and technology advancements. The management’s “unwavering commitment” to providing its partners with high-performance equipment is still their major priority, though.
The tripling of capacity from the 36-qubit Cepheus-1 to the 108-qubit Cepheus-1-108Q, according to Rigetti, would eventually enable customers to explore more intricate real-world quantum computing applications.
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