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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →IonQ and Rigetti build quantum computers using different kinds of qubits: IonQ traps individual ions, while Rigetti uses superconducting circuits. That distinction affects how the systems are built and operated, but it does not make either company the universal winner. To compare them fairly, look at a specific processor, task, benchmark method, date, and access conditions—not qubit count or a single vendor-reported metric.
What is the difference between IonQ and Rigetti?
| Comparison | IonQ | Rigetti |
|---|---|---|
| Qubit technology | Trapped ions: individual atoms are held in traps and controlled with optical methods; IonQ’s roadmap also lists microwave operations for newer generations. IonQ roadmap | Superconducting qubits. Its Cepheus-1-108Q processor combines twelve interconnected chiplets, each with nine qubits. Rigetti’s April 7, 2026 release |
| How the system scales | IonQ describes all-to-all connectivity on roadmap systems and a modular approach to connecting systems. These are company descriptions, not a guarantee that every circuit runs without routing or overhead. IonQ roadmap | The 108 physical qubits in Cepheus-1-108Q are distributed across interconnected chiplets. Rigetti’s April 7, 2026 release |
| Published performance figures | IonQ said it achieved 99.99% two-qubit gate fidelity in 2025; this is a company-reported result and is not a matched comparison with Rigetti’s system. IonQ’s April 22, 2026 announcement | For Cepheus-1-108Q, Rigetti reported 99.1% median two-qubit gate fidelity, approximately 60 ns gate speed, and 99.9% median single-qubit gate fidelity. Rigetti’s April 7, 2026 release |
| Cloud access named in reviewed sources | IonQ says its services are available through major cloud providers, but the announcement reviewed here does not specify current device, provider, or region combinations. IonQ’s April 22, 2026 announcement | Rigetti listed QCS, Amazon Braket, Microsoft Azure Quantum, and qBraid in its Q1 2026 report; Cepheus-1-108Q was announced as generally available through QCS and Amazon Braket. April system release Q1 2026 report |
The comparison is between different physical approaches, not simply two interchangeable products. Trapped-ion and superconducting hardware involve different engineering choices, and the consequences depend on the processor and circuit being run.
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How do trapped-ion and superconducting qubits work?
IonQ: individual ions held in traps
IonQ’s approach uses charged atoms—ions—held in electromagnetic traps and controlled with light-based operations. Its roadmap describes all-to-all connectivity for listed systems and identifies microwave operations in descriptions of later generations. Those features describe the company’s architecture and plans; they do not, on their own, specify the time, error rate, or total cost of executing a particular program.
Rigetti: superconducting circuits joined in chiplets
Rigetti’s processors use superconducting qubits fabricated as circuits. Cepheus-1-108Q organizes 108 physical qubits as twelve connected nine-qubit chiplets. This chiplet arrangement is the company’s approach to building a larger processor from smaller tiles. How well it serves a workload depends on the processor’s operations, connections, and the compiler’s handling of the circuit.
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Which company has more qubits?
The clearest specific system count in the dated figures is Rigetti’s 108 physical qubits in Cepheus-1-108Q, announced in April 2026. IonQ’s live roadmap lists targets that include 100–256+ physical qubits and 12 logical qubits for 2026, but these are roadmap milestones rather than an apples-to-apples count of a named, delivered system. The two figures also refer to different categories: physical qubits are hardware units; logical qubits are error-corrected units built from physical resources.
More qubits alone do not establish that a computer can solve a larger useful problem. The number of operations a circuit can run reliably, connectivity, gate errors, error correction, compilation, and the task itself all matter. A system with a larger physical-qubit count may not outperform a smaller one on a particular workload.
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Do IonQ and Rigetti’s performance numbers compare directly?
No. Rigetti’s April 2026 figures are stated for Cepheus-1-108Q and include median fidelities and an approximate gate speed. IonQ’s 99.99% figure is a company-reported result achieved in 2025 and disclosed in a 2026 announcement; the announcement does not make it a controlled comparison against Cepheus-1-108Q. The processor, measurement procedure, statistic, and reporting date differ.
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Fidelity estimates how often a quantum operation behaves as intended under a specified measurement method. It is useful, but a gate-fidelity figure is not a score for an entire application. Circuit depth, connectivity and routing, error accumulation, measurement, and software can change end-to-end results. Compare vendors using the same workload and a documented protocol, with the system and date named.
Independent research offers a useful caution against extrapolating from component metrics. A 2023 preprint by Jwo-Sy Chen and colleagues benchmarked IonQ Forte, reporting 30 trapped-ion qubits, all-to-all operations, and success through benchmark suite level #AQ 29. The authors also reported quantitative discrepancies between system-level predictions and experiments, as well as errors outside their model. This was a study of Forte, not a current head-to-head test of IonQ and Rigetti. Read the preprint.
What are the companies planning next?
IonQ’s fault-tolerance trajectory
IonQ’s roadmap lists future physical- and logical-qubit milestones, including 2026 targets of 100–256+ physical qubits and 12 logical qubits. Its April 2026 technical announcement outlines a full-stack blueprint for fault-tolerant computing. These are company plans and descriptions, not evidence that general-purpose fault-tolerant quantum computing has already been delivered. IonQ roadmap IonQ technical announcement
Rigetti’s chiplet targets
Rigetti has described targets over roughly three years of approximately 1,000 qubits, approximately 99.9% two-qubit gate fidelity, and gate speeds below 50 ns. These are forward-looking company targets, not specifications of Cepheus-1-108Q today. Rigetti Q2 2026 report
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Roadmaps help explain each company’s intended direction, but should be kept separate from available hardware and measured results. Milestone dates and technical targets can change.
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Can you use IonQ or Rigetti through the cloud?
Both companies discuss cloud access, but availability depends on the specific processor, cloud catalog, region, and service terms. Rigetti’s April 2026 release named QCS and Amazon Braket for Cepheus-1-108Q. Its Q1 2026 report also named Microsoft Azure Quantum and qBraid among access routes. IonQ describes access through major cloud providers but the cited announcement does not enumerate current device-by-provider availability. Check the live catalog for the intended device, region, queue, supported software, and pricing before planning a run. Rigetti also reports selling on-premises systems, a route aimed at institutional deployment rather than ordinary consumer purchase. Rigetti system release Rigetti Q1 2026 report IonQ announcement
Which one is better for a particular workload?
The published figures do not establish a universal winner. A defensible choice starts with the circuit or application, then checks whether the available device supports its operations and connectivity efficiently. It also considers reliability across the full circuit, software and compiler support, access terms, and whether the result can be reproduced.
- For a research comparison, run the same problem and protocol on the actual devices under consideration, and record the processor, date, compilation choices, and access conditions.
- For an application claim, distinguish a company’s named areas of activity from demonstrated advantage on a real-world workload. IonQ cites areas such as drug discovery, materials science, finance, logistics, cybersecurity, and defense; Rigetti cites materials science, optimization, and quantum simulation as research examples. These examples do not prove broad commercial advantage. IonQ announcement Rigetti system release
- For a purchase or deployment decision, confirm whether cloud use or on-premises hardware fits the organization, and verify current availability and terms directly with the provider.
As of October 4, 2026, the available evidence here does not establish a matched, independent benchmark of current IonQ and Rigetti systems on the same workload with the same measurement protocol. Treat vendor metrics as useful specifications with their attribution and context intact, not as a direct ranking.
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