Rigetti Computing

Rigetti builds gate-model quantum computers from superconducting circuits that run at temperatures near absolute zero. Its main design choice is modularity: rather than making one large chip, it links small nine-qubit 'chiplets' into bigger processors, currently up to 108 qubits. People use the machines over the cloud, through Rigetti's own service and the big cloud marketplaces, or buy smaller units to install on site. Recent work focuses on making two-qubit operations more accurate, an area where its largest system still trails its smaller ones.

publicly listed company (Nasdaq: RGTI, since March 2022 via a SPAC merger) · Based in United States · Since 2013 · Facts checked 27 October 2026

Where it ranks this month

Best place in each race, from QubitBenchmark release 2026-11.1.

All rankings →

Most accurate–No ranked result Error-corrected qubits–No ranked result Most qubits–No ranked result Fastest–No ranked result Use it today–No ranked result

Machines

Machine	Physical qubits	Introduced	How to use it
Cepheus-1-108Q	108	2026	Rigetti Quantum Cloud Services, Amazon Braket, Azure Quantum, qBraid; also sold for on-premises installation
Cepheus-1-36Q	36	2025	Rigetti Quantum Cloud Services (Azure Quantum announced as coming later); one unit deployed at the UK National Quantum Computing Centre
Novera (9-qubit QPU)	9	–	on-premises

Qubit counts as the company reports them. Our rankings use QubitBenchmark's checked results instead.

Promised vs delivered

What Rigetti Computing has said it would build, and what happened.

All roadmaps →

Milestone	Target	Status	Why we say so
Scale to 1,000 qubits by 2024 and 4,000 by 2026 (2021 plan)	2024 / 2026	Slipped	Rigetti's largest system as of October 2026 is the 108-qubit Cepheus-1-108Q, and its current ~1,000-qubit goal is set roughly three years out. Source
84-qubit Ankaa-3 with 99+% median two-qubit fidelity	end of 2024	Delivered	Ankaa-3 launched on 23 Dec 2024 with a reported 99.0% median iSWAP and 99.5% median fSim two-qubit fidelity. Source
36-qubit multi-chip system at 99.5% median two-qubit fidelity	mid-2025	Delivered	Cepheus-1-36Q reached general availability on Rigetti QCS in August 2025 with a reported 99.5% median two-qubit fidelity (company-reported). Source
100+ qubit chiplet system at 99.5% median two-qubit fidelity	end of 2025	Slipped	In January 2026 Rigetti moved general availability to around end of Q1 2026; the 108-qubit system reached GA on 7 April 2026 at 99.1%, not 99.5%, median two-qubit fidelity. Source
Raise Cepheus-1-108Q median two-qubit fidelity to 99.5%	later in 2026	Due this year	The August 2026 results still report about 99.1% median two-qubit fidelity on the 108-qubit system and no longer mention the 99.5% target. Source
336-qubit Lyra system	after the 100+ qubit system (no date)	Unclear	Named in the November 2024 roadmap but not mentioned in any 2025-2026 Rigetti release we opened. Source
150+ qubit system at ~99.7% median two-qubit fidelity	by or around end of 2026	Due this year	Not delivered as of October 2026, and not restated in the May or August 2026 results releases, which mention only the 108-qubit system and a ~3-year path to ~1,000 qubits. Source
1,000+ qubit system at ~99.8% median two-qubit fidelity	by or around end of 2027	Slipped	The August 2026 results recast this as ~1,000 qubits at ~99.9% fidelity 'over roughly a three-year time horizon' (roughly 2029), later than end of 2027. Source
1,000+ qubit system in the UK	within the next three to four years (stated May 2026)	In progress	Announced with up to $100M of UK investment; no specific year given. Source
Publish an updated technology roadmap, including a path to quantum advantage in about three years	second half of 2026	Due this year	Promised in the April 2026 GA release; we found no updated roadmap published as of 27 October 2026. Source

Recent claims, and how far the evidence has got

Announced Cepheus-1-108Q (12 x 9-qubit chiplets) generally available with ~99.1% median two-qubit and ~99.9% single-qubit fidelity, ~60 ns gates Source
Announced 99.8% median two-qubit fidelity at 40 ns on a 9-qubit system using an adiabatic CZ gate, and up to 99.9% on prototypes Source
Announced Cepheus-1-36Q: first multi-chip system at 99.5% median two-qubit fidelity Source

In other organisations' rankings

Where Rigetti Computing appears in other published rankings and lists. They don't change ours.

All of them →

The Quantum Index Report 2026: Quantum Processor Benchmarking (chapter 10), MIT Initiative on the Digital Economy (with Accenture) (2026-10). Broad and well-sourced overview, but it compiles vendor-reported numbers rather than measuring them, and it says no independently verified universal metric exists.
The Quantum Index Report 2026, MIT Initiative on the Digital Economy (MIT Sloan), in collaboration with Accenture (2026-10). Transparent, sourced and openly licensed data, but it measures activity (patents, funding, press releases) rather than how well the machines perform.
Metriq: A Collaborative Platform for Benchmarking Quantum Computers (Metriq Score scoreboard), Unitary Foundation (2026-03-09). Open, reproducible method run by a non-profit, but it covers only about a dozen cloud machines, a missing benchmark scores zero, the composite depends on the chosen baseline, and IBM both funds the work and tops the table.
CB Insights ESP matrices: Quantum computer makers (neutral atoms, photonics, silicon qubit, superconducting circuits, trapped ions), CB Insights (2026). Based on market and business signals, not machine performance. Vendors can brief CB Insights, and most placements are hidden behind a subscription.
Evaluating the performance of quantum processing units at large width and depth, Jülich Supercomputing Centre (Forschungszentrum Jülich) and Purdue University; arXiv preprint (2025-05-28). Careful, independent academic study using one workload; it is a 2025 snapshot that predates newer machines, and the access budgets differed by vendor.

Sources

Rigetti Computing, Wikipedia
Rigetti Computing Reports Third Quarter 2024 Financial Results (Form 8-K Ex. 99.1), Rigetti Computing / SEC EDGAR, 12 November 2024
Rigetti Computing Reports 84-Qubit Ankaa-3 System Achieves 99.5% Median Two-Qubit Gate Fidelity Milestone, The Quantum Insider, 23 December 2024
Rigetti Computing unveils 36-qubit system on cloud platforms, Verdict, 13 August 2025
Rigetti Computing reports on its Q3 2025 financial results, unveils aggressive qubit roadmap to 1,000 qubits, Quantum Computing Report, 11 November 2025
Rigetti Updates Timeline for Cepheus-1-108Q Quantum Processor, The Quantum Insider, 13 January 2026
Rigetti Announces General Availability of 108-Qubit System (press release), GNT (GlobeNewswire release), 7 April 2026
Rigetti releases 108-qubit Cepheus-1-108Q system via cloud platforms, Quantum Computing Report, 7 April 2026
Rigetti Computing Reports First Quarter 2026 Financial Results (Form 8-K Ex. 99.1), Rigetti Computing / SEC EDGAR, 11 May 2026
Rigetti Computing Reports Second Quarter 2026 Financial Results (Form 8-K Ex. 99.1), Rigetti Computing / SEC EDGAR, 6 August 2026
Rigetti Computing Reports Second Quarter 2026 Financial Results, The Quantum Insider, 7 August 2026