Rigetti Surpasses the 100 Qubit Threshold: Introducing Cepheus-1-108Q with 108 Superconducting Qubits

Rigetti has announced the public availability of its new 108-qubit quantum computer, called Cepheus-1-108Q. This device is based on chiplets that are connected to each other with couplers.

Rigetti Launches Its 108 Qubit Quantum Computer

It was in 2021 when Rigetti announced that it would work on the development of a quantum processor made up of interconnected modules capable of operating as a single larger processor. The company has continued to evolve its platform and has now announced the launch of a new 108-qubit QPU, composed of 12 modules of 9 qubits each.

This is an evolution of the 36-qubit model, made up of four modules, launched in 2025. The new system is capable of offering a 99.1% fidelity on two-qubit logic gates and 99.9% on single-qubit gates; the company expects to achieve a fidelity of 99.5% by the end of the year.

A significant aspect of the new device is that it is designed and built with error correction in mind: by using a proprietary implementation of an algorithm for correction, the company has managed to achieve a fidelity of 99.9% on a prototype.

"Cepheus-1-108Q is a milestone that validates our ambitious approach to scaling quantum computers," said Subodh Kulkarni, CEO of Rigetti. "Our proprietary chiplet architecture is paving the way for higher fidelity systems and a greater number of qubits that will ultimately enable fault-tolerant quantum computing."