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IBM says it has been selected for Stage C of DARPA’s Quantum Benchmarking Initiative, moving its proposal from plan review to independent evaluation of its hardware and system approach. IBM targets 2029 for its Quantum Starling system; DARPA’s initiative is assessing whether a fault-tolerant quantum computer can deliver computational value greater than its cost by 2033.
IBM has been selected for Stage C of the U.S. Defense Advanced Research Projects Agency’s Quantum Benchmarking Initiative, moving the company into independent testing and evaluation of its quantum hardware and plans for a fault-tolerant system. The review is part of DARPA’s effort to determine whether a quantum computer whose computational value exceeds its cost can be built by 2033.
Stage C takes IBM beyond the initiative’s earlier review of technical concepts and research plans. According to IBM’s announcement, DARPA’s independent verification and validation team will test company hardware and assess its technology, systems engineering and architectures. The initiative is intended to examine whether the proposed approaches offer a plausible path to a fault-tolerant quantum computer, rather than simply compare near-term devices.
IBM says it expects to deliver its Quantum Starling system in 2029. The company says Starling will combine work on error correction, processor design and systems engineering. IBM also reports progress on hardware components for fault tolerance and on methods for decoding error-correction information; the supplied announcement does not provide independent measurements or detailed results for those claims.
IBM said it passed the first two stages, which examined initial technical concepts and then comprehensive research and development plans, including risks and mitigation approaches. Selection for Stage C means the company is proceeding to testing within the program; it does not mean DARPA has certified that Starling will meet its goals or that a fault-tolerant computer has already been built.
Testing IBM’s Fault-Tolerance Plan
The move matters because fault tolerance is a central hurdle to using quantum computers for sustained, useful calculations. Current quantum systems are susceptible to errors, and addressing those errors requires advances across hardware, error correction and the larger system. Independent testing can give DARPA a basis to examine whether IBM’s proposed path is technically credible, beyond the company’s own descriptions of its progress.
DARPA’s benchmark also frames the question in economic terms: whether a system’s computational value can exceed its cost. That makes the initiative relevant not only to quantum researchers but to organizations deciding whether the technology could eventually justify investment in areas such as science and engineering. Stage C is a review milestone, not evidence that quantum computing has already achieved that value test.
For IBM, advancing could add outside scrutiny to a schedule that places its first fault-tolerant system in 2029. That target remains a company projection. The DARPA process may evaluate the technical case and the risks, but the announcement does not say that the agency endorses IBM’s timeline.
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How DARPA’s Three Stages Work
DARPA launched the Quantum Benchmarking Initiative in 2024 to assess whether an industrially useful fault-tolerant quantum computer can be built by 2033. The initiative defines the goal in terms of a computer whose computational value exceeds its cost. IBM’s announcement describes three stages completed or underway so far: an initial technical concept in Stage A, a detailed research and development plan in Stage B, and hardware evaluation by an independent team in Stage C.
The distinction between the stages is material. Passing the earlier phases meant that IBM’s proposal and planning advanced through DARPA’s assessment; Stage C introduces testing of hardware and evaluation of broader system approaches. IBM has also said it works with more than 340 organizations using its quantum computers as scientific tools. That figure is a company-reported measure of its network, not an independent assessment of commercial usefulness or fault tolerance.
“Advancing to the third stage of DARPA’s Quantum Benchmarking Initiative validates the strength of IBM’s path to building a fault-tolerant quantum computer.”
— Jay Gambetta, director of IBM Research and an IBM Fellow
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What Stage C Has Yet to Establish
The announcement does not give a schedule for Stage C testing, describe specific test protocols, or disclose results from the independent team. It also does not say what measurements DARPA will use to determine whether IBM’s hardware and architecture meet the initiative’s objectives, or when the agency will report its assessment.
IBM’s 2029 delivery target and claims of technical progress remain company statements in the material provided. It is not yet clear whether the testing will change that timetable, identify technical or cost-related obstacles, or lead to public findings about the feasibility of IBM’s approach. Selection for Stage C should not be read as a guarantee that the system will be completed or satisfy DARPA’s 2033 benchmark.
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Independent Hardware Testing Ahead
DARPA’s independent verification and validation team is expected to test IBM’s hardware and assess the company’s system approach as part of Stage C. IBM says it will work with the team during the review. No test timetable or results date was included in the announcement, so the next public milestone is not yet specified.
Readers can watch for details from DARPA or IBM about the scope and outcomes of the evaluation, and for updates on IBM’s stated 2029 Quantum Starling target. Those developments will help clarify how the hardware performs under review and whether the plan remains on course toward DARPA’s 2033 goal.
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Key Questions
What does IBM’s selection for Stage C mean?
It means IBM advances to the initiative’s hardware-evaluation phase. DARPA’s independent verification and validation team is expected to test hardware and assess the company’s technology, systems engineering and architecture.
Does Stage C mean IBM has built a fault-tolerant quantum computer?
No. The selection is a step in DARPA’s review process, not confirmation that IBM has already built a fault-tolerant system or met the initiative’s performance and cost goals.
When does IBM expect to deliver Quantum Starling?
IBM says it expects to deliver the system in 2029. That is the company’s target, and the announcement does not establish it as a guaranteed delivery date.
What is DARPA trying to determine by 2033?
DARPA’s initiative aims to assess whether an industrially useful fault-tolerant quantum computer can be built by 2033, with computational value that exceeds its cost.
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