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IonQ (NYSE: IONQ) and Rigetti Computing (Nasdaq: RGTI) are not interchangeable quantum stocks. IonQ uses trapped-ion hardware, has the larger commercial platform, materially higher revenue, a much larger backlog and more capital. Rigetti uses superconducting chips, controls an in-house fabrication line and offers a more leveraged bet on faster gate speeds and chiplet scaling. For most investors comparing the two in November 2026, IonQ is the less speculative choice; Rigetti is the higher-risk, higher-upside optionality play if its 108-qubit systems and future 300-plus-qubit roadmap convert into sustained sales.
This is a dated comparison, not investment advice. Prices, analyst targets and valuation multiples below reflect information available through the 11 November 2026 close unless a company filing or release is specifically dated.
| Name | Best for | Key spec | Platforms | Checked |
|---|---|---|---|---|
| IonQ (IONQ) | Investors prioritizing commercial traction, backlog and balance-sheet capacity | Trapped-ion systems; Tempo deployments and Superion 256; 99.99% two-qubit fidelity milestone reported for 2025 | IonQ cloud access, Amazon Braket, Microsoft Azure Quantum, Google Cloud, direct contracts and on-premises systems | November 2026 |
| Rigetti Computing (RGTI) | Investors seeking a speculative superconducting/chiplet scaling bet | Cepheus-1-108Q; 99.5% median two-qubit fidelity in Q3 2026; 50–70 nanosecond gate speeds | Quantum Cloud Services, Amazon Braket, Azure Quantum, qBraid and on-premises Novera systems | November 2026 |
What is the main difference between IonQ and Rigetti?
The decisive difference is the hardware modality and the commercial stage. IonQ traps charged atoms in electromagnetic fields and manipulates them with lasers. Rigetti etches superconducting circuits on silicon and operates them in cryogenic refrigerators near absolute zero.
Those choices create different engineering trade-offs:
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- IonQ’s trapped ions: the company emphasizes very high gate fidelity and all-to-all connectivity, meaning any trapped ion can theoretically interact with any other without the fixed-neighbor wiring used by many superconducting layouts. The trade-off is slower gate operation and difficult scaling of large ion chains.
- Rigetti’s superconducting circuits: the company emphasizes fast gates, modular chiplets and control over its own fabrication process. The trade-offs include cryogenic complexity, calibration overhead and the need to maintain fidelity as more chiplets are connected.
IonQ is also broader than a single quantum-computer business. Its 2026 reporting includes quantum computing, sensing, security and the SkyWater foundry operation acquired during the year. Rigetti remains a more focused vertically integrated quantum manufacturer, combining chip design, Fab-1 fabrication, control electronics, cloud access and on-premises systems.
How do IonQ and Rigetti’s technologies compare?
| Technology factor | IonQ | Rigetti |
|---|---|---|
| Qubit type | Trapped ions: charged atoms held electromagnetically and manipulated with lasers | Superconducting circuits etched on silicon and cooled cryogenically |
| Industry comparison | A distinct approach from the superconducting systems associated with IBM and Google | The same broad modality used by IBM and Google |
| Claimed strength | High two-qubit fidelity and all-to-all connectivity | Fast gates, modular chiplet scaling and in-house fabrication |
| Latest cited fidelity | 99.99% two-qubit gate fidelity, a 2025 company milestone reported by The Motley Fool | 99.5% median two-qubit gate fidelity on Cepheus-1-108Q in Q3 2026; 99.6% on an 80-qubit sublattice and 99.7% on a 50-qubit sublattice |
| Typical gate speed | Slower than superconducting gates | 50–70 nanoseconds; Cepheus-1-108Q is described at about 60 nanoseconds |
| Current systems | Tempo deployments, Superion 256 on-premises systems and Forte Enterprise in the cloud mix | Cepheus-1-108Q, a 12-by-9-qubit chiplet system, and the nine-qubit Novera QPU |
The fidelity figures are not an apples-to-apples contest. IonQ’s 99.99% number is a dated record milestone, while Rigetti’s 99.5% is a median result reported on a 108-qubit system in Q3 2026. They differ in date, test context, system scale and how the statistic is summarized. No shared, peer-reviewed application benchmark establishes a universal winner.
Rigetti states that its systems achieve gate speeds of 50–70 nanoseconds, “which is about 10,000 times faster than trapped-ion systems and 100 times faster than neutral-atom systems.” Faster gates can reduce the time spent executing a circuit, but speed alone does not determine useful performance: error rates, connectivity, compiler overhead, measurement quality and error correction also matter.
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IonQ unveiled a 256-qubit Superion system in 2026 and is placing Tempo systems with customers. A planned NVIDIA Accelerated Quantum Research Center installation is intended to be its first on-premises QPU at that site. IonQ has cited a $33 million multi-product contract with South Korea’s SDT and a $25 million contract with Florida International University. A call summary reported by Stock Taper said Superion 256 capacity for 2027 was sold out into 2028, although that statement is a management call summary rather than an independently audited shipment schedule.
IonQ’s longer-term ambition is much larger: The Motley Fool reported that management is aiming toward two million qubits by 2030. That is a roadmap objective, not a delivered product or a guarantee that a commercially useful, error-corrected machine will exist on that schedule.
Rigetti made its Cepheus-1-108Q generally available through Quantum Cloud Services and Amazon Braket in April 2026. The architecture uses 12 nine-qubit chiplets. Its Novera nine-qubit QPU targets laboratories that already have compatible cryogenic infrastructure, while larger 9- to 108-qubit systems can be sold as on-premises installations.
Rigetti’s stated milestones are a 300-plus-qubit system with approximately 99.7% median two-qubit fidelity and sub-60-nanosecond gates by mid-2028, followed roughly three years later by a 1,000-qubit system targeting approximately 99.9% fidelity and sub-50-nanosecond gates. Those targets describe an engineering plan; they are not current revenue or performance results.
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Which company has more commercial traction?
IonQ is far ahead on reported sales and contracted work. In its Q3 2026 release, IonQ reported $173.8 million of quarterly revenue, up 336% year over year, and raised full-year guidance to $505 million–$515 million. Remaining performance obligations reached $1.2 billion, including $689 million in the Platform segment and $479 million in SkyWater.
IonQ’s Q3 Platform revenue was $90.3 million, up 127% year over year. SkyWater Foundry Services contributed $83.5 million after only two months in the results following the end-of-July closing. IonQ said non-IonQ quantum foundry revenue was up more than 30% year over year. The reported revenue therefore combines quantum-computing and related platform activity with a newly acquired semiconductor-foundry operation; it should not be read as pure quantum-computer sales.
IonQ also reported a $28 million DARPA optical-clock contract with a $30 million option for 100 additional units. It was the only trapped-ion company identified in the available data as reaching Stage C of DARPA’s Quantum Benchmarking Initiative, a program with potential value of up to $300 million. These awards can validate technology and provide funding, but government contracts may have milestones, options and acceptance conditions that delay revenue recognition.
Rigetti’s commercial base is much smaller. Its Q3 2026 results showed $1.4 million of revenue, down from $1.9 million a year earlier. The quarter contained no system sales: collaborative research and professional services generated $1.265 million, while cloud access generated $0.146 million. System and component sales had been $3.05 million in Q1 and $4.10 million in Q2.
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Rigetti’s remaining performance obligations were only $2.9 million at 30 September 2026, versus IonQ’s $1.2 billion. The company expects approximately $20 million of 2026 revenue, but that outlook explicitly depends on customer acceptance and revenue recognition for an $8.4 million 108-qubit system supplied to India’s C-DAC in Q4. A columnist at The Motley Fool estimated that more than 90% of Rigetti revenue came from government contracts; that is a published commentary figure, not a separate company restatement.
How do the latest financial results compare?
| Metric | IonQ | Rigetti |
|---|---|---|
| Q3 2026 revenue | $173.8 million, up 336% year over year | $1.4 million, versus $1.9 million a year earlier |
| First nine months of 2026 | $318.55 million, up 367.6% from $68.13 million | $10.9 million, up about 110% from $5.2 million |
| Q3 operating loss | $433.08 million | $33.2 million |
| Q3 GAAP net income or loss | $564.0 million profit, largely from an $896 million non-cash warrant mark-to-market gain | $3.1 million loss, including a $25.3 million non-cash warrant gain |
| Q3 adjusted result | Adjusted EBITDA loss of $133.6 million; adjusted EPS of negative $0.29 | Non-GAAP net loss of $20.5 million; non-GAAP EPS of negative $0.06 |
| 2026 company outlook | $505 million–$515 million | Approximately $20 million, contingent on C-DAC acceptance |
Prices checked November 2026.
IonQ’s headline GAAP profit is not operating profitability. The warrant revaluation produced a large non-cash gain, while the company still reported a $433.08 million operating loss and approximately $331.9 million of negative free cash flow for the quarter in the Stock Taper earnings-call summary. Rigetti’s smaller GAAP loss also benefited from warrant accounting; its $33.2 million operating loss is the more useful measure of the underlying business.
For context, IonQ generated approximately $130 million of revenue in 2025, compared with approximately $7.1 million for Rigetti. The scale gap is widening in absolute dollars even though both companies remain loss-making and dependent on future growth.
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Which stock is cheaper on sales?
IonQ is expensive by conventional software or hardware standards, but Rigetti is substantially more expensive relative to the revenue it currently produces. Business Quant’s 11 November 2026 figures put trailing-twelve-month revenue at $380.44 million for IonQ and $12.82 million for Rigetti.
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|---|---|---|
| Price-to-sales | About 33.8×–37.6× | About 285×–325× |
| Enterprise value to revenue | About 35.1× | About 295× |
| Price-to-book | About 2.7×–2.8× | About 7.0×–7.7× |
| Market capitalization at 11 November close | About $14.8 billion | About $3.7 billion |
The ranges come from different aggregator conventions and should not be treated as precision measurements. The underlying conclusion is consistent in the Business Quant comparison: investors pay roughly 38 times trailing sales for IonQ and more than 300 times for Rigetti. IonQ’s multiple could fall into the low 30s on the company’s $505 million–$515 million 2026 revenue outlook, before considering cash. Rigetti remains a triple-digit sales multiple even if it reaches approximately $20 million in 2026 revenue.
Neither stock has a meaningful forward price-to-earnings ratio because consensus expects losses. Price-to-sales also has limitations here: IonQ’s trailing period includes two months of SkyWater foundry revenue, while Rigetti’s sales are unusually lumpy because a single system acceptance can change a quarter dramatically.
How strong are the balance sheets, and what is the dilution risk?
IonQ had approximately $1.7 billion in cash, cash equivalents and investments at 30 September 2026. A $2.0 billion equity offering that closed on 16 October lifted the pro forma total to approximately $3.7 billion. That offering increased the capital available for manufacturing, research and acquisitions, but issuing shares and pre-funded warrants dilutes existing holders. IonQ also agreed to acquire cybersecurity company Elisity in a stock transaction valued at up to $1.3 billion according to The Motley Fool, creating additional integration and dilution uncertainty.
Rigetti reported $497.1 million of cash, cash equivalents and available-for-sale investments at 30 September 2026, with no debt. Its Q3 free cash flow was approximately negative $43.3 million and capital expenditure was $26.2 million. A third-party estimate cited in the available data put cash runway at roughly 11.3 quarters at the Q3 burn rate, but that runway would shorten if Rigetti accelerates spending on 300- and 1,000-qubit systems or expands manufacturing capacity.
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The practical comparison is straightforward: IonQ has more dollars and a larger financing cushion, but it is also spending aggressively and has issued substantial new equity. Rigetti has no debt and several years of estimated runway at its recent burn, but its smaller revenue base makes each contract, acceptance milestone and capital raise more consequential.
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What do the stock returns and volatility say?
| Market measure | IONQ | RGTI |
|---|---|---|
| 11 November 2026 close | $34.06 | $11.11 |
| 52-week range | $24.91–$73.65 | $9.19–$31.65 |
| 2026 year to date | −24.09% | −49.84% |
| One-year return | About −37.4% | About −64.6% |
| One-year volatility | About 93%–95% | About 96%–97% |
| One-year beta versus the S&P 500 | 3.49 | 3.81 |
| Dividend | None | None |
The historical record is extremely uneven. PortfoliosLab shows Rigetti up 1,449.40% in calendar 2024 and 45.15% in 2025 before falling 49.84% in 2026 through 12 November. IonQ rose 259.13% in 2023 and 237.13% in 2024, gained 7.42% in 2025 and then fell 24.09% in 2026. Both suffered severe 2022 collapses.
One-year daily-return correlation was approximately 0.89–0.91 in Business Quant and PortfoliosLab. That means buying both is not a reliable hedge: the pair has recently traded as a single high-beta quantum-computing factor. The companies’ drawdowns, roughly 59% for IonQ and 80% for Rigetti from prior highs in the cited PortfoliosLab snapshot, illustrate the possibility of permanent capital loss even when a long-term technology thesis remains intact.
What catalysts could change the IonQ thesis?
- Execution against the backlog: converting the $1.2 billion of remaining performance obligations into recognized revenue would support IonQ’s commercial-incumbent narrative.
- Tempo and Superion deployments: additional cloud capacity and on-premises systems could broaden access and increase recurring usage.
- SkyWater integration: foundry capacity may improve manufacturing control and create revenue outside IonQ’s own machines, but acquisition accounting and integration costs complicate near-term earnings.
- Government and sensing contracts: the DARPA optical-clock work and Quantum Benchmarking Initiative could validate adjacent businesses.
- Capital allocation: the $3.7 billion pro forma cash position gives IonQ options, while the Elisity transaction adds execution and dilution risk.
The central IonQ risk is that a large backlog and ambitious roadmap are mistaken for near-term operating profit. Revenue growth has been strong, but operating losses, cash burn, stock issuance and acquisition integration remain material.
What catalysts could change the Rigetti thesis?
- C-DAC acceptance: recognizing the $8.4 million 108-qubit system in Q4 is important to the approximately $20 million 2026 outlook and would demonstrate that system sales can return after a zero-sales Q3.
- CHIPS award execution: up to $100 million from the Commerce Department could fund miniaturized readout, a new cryostat architecture and high-connectivity fabrication.
- Customer expansion: HPE and the Pittsburgh Supercomputing Center expanded collaboration around Novera for hybrid quantum-classical research.
- Cepheus performance: maintaining 99.5% median two-qubit fidelity while adding chiplets would strengthen the superconducting scaling argument.
- Commercial mix: growth in cloud access, enterprise systems and non-government work would reduce dependence on a small number of public-sector programs.
Rigetti’s main risk is binary execution. Its valuation assumes that technical milestones become repeatable product shipments and that revenue grows far faster than it has so far. A delayed acceptance, additional financing or weaker fidelity at larger chip counts could expose the gap between roadmap ambition and current economics.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which quantum stock is the better buy for different investors?
| If your priority is… | Better fit | Why |
|---|---|---|
| More current revenue and contracted work | IonQ | Q3 revenue was $173.8 million versus $1.4 million, and RPO was $1.2 billion versus $2.9 million. |
| Lower sales multiple within this pair | IonQ | Its roughly 34×–38× trailing price-to-sales ratio is far below Rigetti’s roughly 285×–325×. |
| Trapped-ion fidelity and connectivity | IonQ | Its architecture emphasizes high fidelity and all-to-all connectivity. |
| Superconducting gate speed and chiplets | Rigetti | Its architecture targets 50–70 nanosecond gates and modular scaling. |
| Largest cash cushion | IonQ | Pro forma cash, cash equivalents and investments were approximately $3.7 billion. |
| Pure, smaller-cap superconducting optionality | Rigetti | Its lower market capitalization creates greater leverage to a successful product transition, but also greater execution risk. |
| Income or near-term GAAP profits | Neither | Both report operating losses and pay no dividend. |
Several published commentators reached a similar qualitative conclusion. Robert Izquierdo wrote in October coverage that IonQ was the better investment because of its revenue trend and lower sales multiple. Adria Cimino wrote in November coverage that IonQ offered less risk and a stronger balance sheet. Those are opinions, not an official ranking or a guarantee of returns.
TipRanks’ 3 November snapshot showed a Strong Buy consensus and an average 12-month target of $65.45 for IonQ, and a Moderate Buy consensus with a $26.57 average target for Rigetti. Measured from the 11 November closes of $34.06 and $11.11, those targets imply approximately 92% and 139% upside, respectively. The targets were published before both companies’ latest earnings prints, so they can lag the information now available and should not be treated as probability-weighted forecasts.
For most readers, IonQ is the better risk-adjusted comparison. It has much greater revenue, backlog, cash and customer breadth, and its sales multiple is lower despite being expensive. Rigetti can make sense only for an investor who specifically wants superconducting-chiplet exposure, accepts a sub-scale revenue base and is prepared for a binary C-DAC and roadmap execution story. Neither stock suits a low-volatility, income or near-term-profit mandate.
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How should you interpret the quantum-computing opportunity?
Quantum computing may become a large industry, but a large eventual market does not guarantee that either public company captures attractive returns. The Motley Fool cited McKinsey estimates of $1.3 trillion–$2.7 trillion in eventual economic value by 2035, with $60 billion–$100 billion potentially accruing to producers such as IonQ and Rigetti. That is total economic value and a cited secondary estimate, not a revenue forecast for either stock.
Neither company has demonstrated that quantum advantage is already a material earnings driver. Rigetti links a possible advantage demonstration to a future machine of about 1,000 qubits, approximately 99.9% fidelity and sub-50-nanosecond gates. IonQ is selling 256-qubit systems and discussing a two-million-qubit 2030 ambition. Both timelines can slip, and useful error-corrected computation may require engineering advances beyond simply increasing physical-qubit counts.
What should you check before buying either stock?
- Separate operating results from accounting gains. Read operating loss, adjusted EBITDA, free cash flow and warrant disclosures instead of relying on GAAP net income alone.
- Reconcile revenue quality. Identify how much comes from recurring cloud usage, hardware acceptance, research services, government work and acquired foundry operations.
- Track backlog conversion. Remaining performance obligations matter only when systems are delivered, accepted and recognized as revenue.
- Watch dilution. Review equity offerings, pre-funded warrants, government equity awards, acquisition consideration and any at-the-market program.
- Use dated valuation data. Both shares can move sharply; refresh market capitalization, enterprise value and trailing revenue before making a decision.
- Set a technology milestone, not just a price target. For IonQ, that might be deployment and backlog conversion. For Rigetti, it might be C-DAC acceptance, repeat system sales and fidelity at larger chiplet counts.
- Size for drawdowns. Historical volatility above 90%, high beta and large prior drawdowns make either stock unsuitable for money needed in the near term.
There is no regulator or standards body that ranks IonQ above Rigetti. The more defensible comparison is a choice between a better-funded commercial platform and a smaller, more leveraged superconducting scaling bet.
How were these IonQ and Rigetti picks evaluated?
The comparison covers the factors that most directly determine shareholder risk and potential: qubit modality, current system capability, fidelity and gate-speed claims, commercial revenue, remaining performance obligations, customer mix, manufacturing control, cash and dilution, valuation, volatility and the credibility of each roadmap. Company releases and filings provide the operating figures; market data and multiples are dated snapshots from the cited aggregators. No head-to-head hardware benchmark establishes a single technical winner.
Frequently Asked Questions
Do IonQ and Rigetti have positive operating cash flow?
No. Both companies are still funding research, manufacturing and commercial expansion while reporting operating losses. A warrant revaluation can make GAAP net income look positive or reduce a reported loss without bringing cash into the business.
Does a higher qubit count automatically make one company’s machine better?
No. Physical-qubit counts are meaningful only alongside fidelity, connectivity, gate speed, calibration stability and error-correction requirements. A 256-qubit trapped-ion system and a 108-qubit superconducting chiplet system use different architectures, so the raw counts are not a ranking by themselves.
What happens if Rigetti’s C-DAC system is not accepted in Q4 2026?
The company’s approximately $20 million 2026 revenue outlook is explicitly contingent on that acceptance and revenue recognition. A delay would push revenue into a later period, weaken near-term sales evidence and make the stock’s already high sales multiple harder to justify.
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Not reliably. Their one-year daily-return correlation was approximately 0.89–0.91 in the cited market-data snapshots, so both can fall together when investors reduce exposure to speculative quantum shares. Holding both is better understood as doubling down on the theme than as diversifying it.
