A new scientific critique has raised further doubts about Microsoft’s claimed quantum computing breakthrough.
The criticism appeared in the journal Nature and challenges research that supports Microsoft’s plan to develop a working quantum computing system by 2029.
Quantum Computing Becomes a Strategic Priority
Quantum computers could eventually solve scientific, technological and cybersecurity problems that conventional machines cannot handle.
The sector has also become a priority for the Trump administration. The U.S. government has invested approximately $2 billion in quantum research and recently established a goal of creating a scientifically useful quantum system by 2028.
Microsoft is developing its own quantum computer alongside major competitors such as IBM, Google and Quantinuum.
However, Microsoft has taken a different approach. While its rivals rely on more established quantum technologies, Microsoft has spent nearly two decades pursuing a system based on Majorana particles.
The company believes this technology could eventually allow it to move ahead of its competitors.
Microsoft Defends Its Quantum Research
Microsoft said it continues to support its scientific findings and believes its quantum computing program is making meaningful progress.
The company issued a formal response to the latest criticism and defended the practical value of its research.
However, Microsoft’s quantum program has faced skepticism before. Two Microsoft-supported papers were previously withdrawn from Nature, while editors raised concerns about possible issues in two other studies published in Nature and Science.
Microsoft said the withdrawn Nature papers were produced outside its own laboratories. The company also stated that it had not reviewed the underlying data before the papers were published.
Nature Critique Challenges Key Microsoft Paper
The latest peer-reviewed critique was written by Henry Legg, a quantum physics lecturer at the University of St. Andrews in Scotland.
Legg examined a Microsoft paper published in Nature in February 2025. Although the study is not being withdrawn, it has played a central role in the company’s subsequent quantum computing work.
Microsoft announced last year that it had detected evidence of the Majorana, a theoretical subatomic particle that is essential to its quantum computing strategy.
However, the company has not published that specific discovery in a peer-reviewed scientific journal.
The February 2025 study made a narrower claim. It said Microsoft had created software capable of detecting an extremely small energy gap inside a highly conductive wire.
Why the Energy Gap Matters
Qubits are the basic units used by quantum computers. They can process information in ways that traditional computer bits cannot.
However, qubits are highly fragile and can lose their quantum state within fractions of a second.
Microsoft believes that identifying a stable energy gap inside a conductive wire could help create more reliable qubits. These longer-lasting qubits could make quantum computers more practical and useful.
Researcher Questions Microsoft’s Results
Legg argued that Microsoft’s software produced inconsistent results and that some of the findings were reported inaccurately.
He also examined a larger dataset that Microsoft had released but did not include in the original Nature paper.
According to Legg, the additional information appeared to show random noise rather than clear evidence of the energy gap Microsoft claimed to detect.
He argued that searching through a sufficiently large amount of random data can eventually produce a pattern that appears meaningful, even when no genuine scientific signal exists.
Microsoft Says the Software Works in Practice
Microsoft rejected the criticism and described its software as a practical tool for identifying suitable locations to place qubits on its quantum chips.
Chetan Nayak, who leads Microsoft’s quantum hardware program, said the company regularly uses the software while preparing chips for quantum computing operations.
Nayak argued that the system’s practical use supports Microsoft’s claim that the underlying technology works.
Scientists Remain Skeptical of Majorana Approach
Other researchers have also questioned whether Microsoft has produced enough evidence to support its Majorana-based strategy.
University of Pittsburgh physicist Sergey Frolov said competing approaches used by companies such as IBM and Quantinuum are supported by a longer record of scientific research.
According to Frolov, Microsoft has not yet established a reliable experimental foundation proving that Majorana-based quantum computing advances are achievable.
He added that several Microsoft-backed papers have faced challenges over fundamental scientific questions.
The latest criticism may therefore increase pressure on Microsoft to publish stronger peer-reviewed evidence as it works toward its goal of delivering a functional quantum computing system by 2029.
