Rigetti Computing
Full-stack superconducting quantum-computing vendor. Designs and fabricates transmon-style superconducting qubit processors at its in-house Fab-1 facility in Fremont, California, with a modular multi-chip ("chiplet") architecture that tiles small chips into larger systems to side-step monolithic-yield limits. Founded in 2013 by Chad Rigetti; NASDAQ-listed since March 2022 (RGTI, SPAC merger with Supernova Partners II). The 108-qubit Cepheus-1-108Q general availability launched in April 2026 at 99.1% median two-qubit fidelity, succeeding the 84-qubit Ankaa-3 and a 36-qubit 4x9 multi-chip system that hit 99.5% in 2025.
Timeline
Current flagship
Cepheus-1-108Q — 108-qubit chiplet-based superconducting QPU (successor to 84-qubit Ankaa-3 and 36-qubit 4×9 modular system)
Milestones
- 2026-04108-qubit Cepheus-1-108Q chiplet-based processor general availability — 99.1% median 2Q fidelity at launch (99.5% targeted by end-2026)
- 2025-0736-qubit modular multi-chip system (4 × 9-qubit chiplets) hits 99.5% median two-qubit gate fidelity — 2× error-rate reduction vs Ankaa-3 monolithic baseline; described as industry's largest multi-chip QC at the time
- 2025-04Quanta Computer closes US$35M strategic equity investment at ~$11.59/share; joint commitment of $100M+ over 5 years on superconducting QC development
- 2024-1284-qubit Ankaa-3 system launched — 99.5% median two-qubit gate fidelity on a monolithic chip
- 2022-12Leadership transition — new President & CEO succeeds founder
- 2022-03NASDAQ listing via SPAC merger with Supernova Partners Acquisition Company II — trades as RGTI
- 2022-0280-qubit Aspen-M — the first commercial multi-chip superconducting QPU (two 40-qubit chiplets tiled)
- 2017-06Forest 1.0 quantum-computing platform released; Rigetti opens Fab-1, the first dedicated quantum-chip fabrication facility
- 2013-07Rigetti Computing founded by Chad Rigetti in Berkeley, California (Y Combinator S14 alum)
Roadmap
Capability details
Quantum computing
- Qubit type
- transmon
- Physical qubits
- 108
- Logical qubits
- 0
- 1Q gate fidelity
- —
- 2Q gate fidelity
- 0.991
- T₁
- —
- T₂
- —
- EC code
- —
- Connectivity
- square-lattice (nearest-neighbour)
7 unverified fields
-
modalities.qc.coherence_t1_ms -
modalities.qc.coherence_t2_ms -
modalities.qc.one_q_fidelity -
modalities.qc.ec_code -
shareholders.1.stake_percent— institutional stakes sourced from third-party aggregator; not yet cross-checked against the 2026 DEF 14A proxy -
shareholders.2.stake_percent— same as above -
shareholders.3.stake_percent— founder equity post-2022 departure not publicly disclosed
People
References
- press https://investors.rigetti.com/news-releases/news-release-details/rigetti-demonstrates-industrys-largest-multi-chip-quantum 36-qubit multi-chip 99.5% two-qubit fidelity milestone (July 2025)
- press https://investors.rigetti.com/news-releases/news-release-details/rigetti-computing-launches-84-qubit-ankaatm-3-system-achieves Ankaa-3 84-qubit launch (Dec 2024)
- press https://investors.rigetti.com/news-releases/news-release-details/rigetti-computing-closes-investment-quanta-computer Quanta Computer $35M strategic investment close (April 2025)
- blog https://qcs.rigetti.com/qpus Rigetti QCS QPU catalogue (Cepheus-1-108Q listing)
- blog https://medium.com/rigetti/celebrating-a-decade-of-rigetti-an-evolution-of-technology-and-a-quantum-ecosystem-57b89fff893a Rigetti 10-year retrospective (technology evolution from Aspen through Ankaa)