Rigetti Computing Announces General Availability of 108-Qubit System, Cepheus-1-108Q

Rigetti Computing, Inc. has announced the general availability of its 108-qubit quantum computing system, Cepheus-1-108Q. This system, based on a proprietary chiplet-based architecture, features twelve interconnected 9-qubit chiplets, tripling the capacity of their previous 36-qubit system. Cepheus-1-108Q is currently achieving a 99.1% median two-qubit gate fidelity with a gate speed of approximately 60 ns and a 99.9% median single-gate fidelity. The system is accessible through Rigetti's Quantum Cloud Services (QCS) platform and Amazon Braket. Rigetti plans to further improve the system's fidelity, targeting 99.5% median two-qubit gate fidelity later in 2026 and intends to update its technology roadmap, outlining a path to quantum advantage within approximately three years. The announcement highlights advancements in qubit and coupler design, the use of CZ gates for error correction, upgraded control electronics, and an improved fabrication process.