Nature critique challenges key research
Microsoft’s plan to produce a functioning quantum computer by 2029 is facing new questions after a peer-reviewed critique challenged the research supporting its technological approach.
The analysis, published Wednesday in Nature, examines a February 2025 paper central to Microsoft’s subsequent quantum programme. The paper will not be retracted, but its methodology and reported results have been disputed.
A different route to quantum computing
Quantum computers could eventually address scientific and cybersecurity problems that conventional systems cannot solve. IBM, Google and other competitors are developing machines based on comparatively established quantum technologies.
Microsoft has spent nearly two decades pursuing an alternative architecture involving Majorana particles. The company believes this strategy could produce more reliable qubits and allow it to overtake rivals.
Quantum development has also become a priority for President Donald Trump’s administration, which has invested $2 billion in the field and established a goal of producing a scientific quantum system by 2028.
The search for more stable qubits
Microsoft announced last year that it had detected the Majorana, a subatomic particle theorized for decades and considered essential to its design. That specific discovery has not appeared in a peer-reviewed scientific publication.
The February 2025 Nature paper presented a more limited result. It described software intended to detect a tiny energy gap within an otherwise highly conductive wire.
Identifying that gap is important because qubits, the fundamental units of quantum computers, are extremely fragile and can lose their quantum state within fractions of a second. Microsoft argues that a stable gap could contribute to the development of longer-lasting qubits.
Researcher finds inconsistent results
Henry Legg, a quantum physics lecturer at Scotland’s University of St. Andrews, concluded that Microsoft’s software “yielded inconsistent and misreported outcomes.”
Legg also examined a wider dataset released by Microsoft but excluded from the original paper. In his assessment, the information primarily showed random noise rather than convincing evidence of the reported gap.
He compared the process with searching thousands of pieces of toast until one appears to contain a recognizable religious image.
“If you’re looking into something which is essentially just random physics, eventually you will find the Jesus in your toast,” Legg said.
Microsoft defends its methodology
Microsoft rejected the criticism in a formal response published by Nature. The company described its software as a “practical tuning tool” used to identify suitable areas of its chips for positioning qubits.
Chetan Nayak, who oversees Microsoft’s quantum hardware programme, said the code is already used regularly to configure chips performing quantum operations.
“It’s almost like arguing, is flight possible or not? And then you’re standing next to an airplane,” Nayak said. “Well, why don’t you hop in and take a ride?”
Microsoft maintains that its research remains valid and says its quantum programme is achieving practical progress despite the continuing scientific debate.
Earlier papers add to the doubts
The company’s work in this field has faced scrutiny before. Two Microsoft-backed papers were retracted by Nature, while editors issued warnings about possible research concerns involving two additional studies, one published in Nature and another in Science.
Microsoft said the retracted studies were conducted outside its laboratories and that its researchers had not reviewed the underlying data before publication. Legg’s analysis raises concerns about a fifth paper.
Critics demand stronger experimental foundations
Sergey Frolov, a physicist at the University of Pittsburgh who has previously questioned Microsoft’s research, argued that the Majorana strategy lacks the extensive experimental support available for technologies pursued by companies such as IBM and Quantinuum.
“Neither Microsoft nor anyone else has laid a foundation where it is clear that these (Majorana-based) advances are plausible, through a series of reliable experiments,” Frolov said. “On the contrary, we have a series of papers that keep being challenged at the very basic level, by different people.”
The disagreement leaves Microsoft under pressure to produce reproducible scientific evidence as it works toward its promised 2029 system and attempts to convert a disputed physical concept into operational quantum hardware.
