Rigetti Computing has postponed the general availability of its 108-qubit Cepheus-1-108Q system to the end of Q1 2026, citing the need for an additional chip iteration to resolve complexities with its tunable couplers. Management emphasized that this extra development cycle is designed to ensure the system meets its internal threshold of 99.5% median two-qubit gate fidelity before commercial release. The adjustment in the roadmap follows the discovery of unexpected inter-chiplet interactions as qubit counts scale, and represents a strategic decision to prioritize performance validation over an accelerated launch schedule.

Despite the launch delay, Rigetti reported consistent gains in gate fidelity across its portfolio: the 108-qubit prototype has achieved a median two-qubit gate fidelity of 99%, the 36-qubit system stands at 99.6%, and the 9-qubit platform has reached 99.7%. These figures mark incremental progress toward the company’s 99.5% target for the Cepheus-1-108Q and demonstrate narrowing performance gaps at higher qubit counts. Investors should note that each 0.1% improvement in fidelity can translate into significant reductions in quantum error correction overhead, potentially accelerating time-to-solution for early enterprise and research customers.

Cepheus-1-108Q leverages Rigetti’s modular design, combining twelve 9-qubit chiplets into a single system—the largest multi-chip quantum computer deployed to date. This approach builds on the company’s 2025 rollout of the four-chiplet Cepheus-1-36Q, and benefits from gate speeds of 50–70 ns, which are an order of magnitude faster than alternative modalities. All chip fabrication occurs at Rigetti’s Fab-1 facility, the industry’s first dedicated quantum device manufacturing plant, underscoring the company’s vertical integration strategy. For investors, this insourced production model may mitigate supply-chain risk and support tighter control over technology roadmaps as Rigetti scales toward systems in excess of 150 qubits by year-end 2026.