Microsoft's Majorana Chip: The Debate and the Evidence
Why anyone cares about topological qubits
Most qubits are fragile. A topological qubit would store information in a more global property of a material, so that small local disturbances cannot easily scramble it. If it works, error protection would be partly built in, which could cut the huge overhead of error correction. The idea is explained in topological qubits explained. The prize is large, which is why Microsoft has pursued it for years.
What Microsoft announced
In a February 2025 press release, Microsoft said its researchers had made the first topological qubit and placed eight Majorana based qubits on a chip called Majorana 1, which it said was designed to hold a million. It came with a Nature paper by more than 160 researchers. According to Physics World, the paper itself does not claim a topological qubit. It reports measurements on aluminium and indium arsenide nanowires that are consistent with, but not definitive proof of, Majorana zero modes at the wire ends. Its main advance is a faster, more accurate way to measure electron parity.
What the critics said
- Nature's editors: They said they consulted two reviewers and concluded the manuscript's results do not show evidence for Majorana zero modes in the reported devices.
- Winfried Hensinger, University of Sussex: The peer reviewed paper contains no proof of topological qubits, and the press release goes further than the paper. He estimated topological computing is roughly 20 to 30 years behind other platforms. That is one expert's opinion.
- Ivar Martin, Argonne: Praised the device as a notable materials and fabrication achievement but said much work would remain to exploit topological protection even if Majorana modes are confirmed.
- Scott Aaronson, UT Austin: If the claim holds it is a major milestone, though earlier setbacks make experts cautious.
The history that colours the debate
In 2018, Microsoft linked researchers at Delft and other labs claimed evidence for these particles. That work was later retracted after others raised problems with the data. This does not prove the new claim wrong, but it explains why physicists ask for evidence that is hard to explain any other way.
Microsoft's response
Chetan Nayak, who leads the effort, said the supporting evidence was gathered between the paper's March 2024 submission and its publication, and he planned to present it at the American Physical Society's Global Physics Summit in March 2025. Coverage of that talk reported that it did not win over many skeptics, while some researchers noted many positive signs and called it premature to label the result a qubit.
What about 2026?
Several outlets report that Microsoft unveiled a newer chip, Majorana 2, on June 2, 2026 at its Build event, claiming a roughly 1,000-fold gain in qubit reliability over the first chip. These are Microsoft's own claims, coverage says the accompanying technical paper had not yet been peer reviewed, and we have not checked Microsoft's own announcement, so we do not repeat further figures. If you see big numbers, look for a paper, check whether independent groups have reproduced the key tests, and see what reviewers said.
How to read a scientific dispute
- Separate the press release from the paper. They can say different things.
- Ask what independent labs found.
- Look for the specific test that would settle it, and whether it has been run.
- Remember that a negative review of one claim is not a verdict on a whole field.
The optimistic, honest view
Even skeptics describe the materials and measurement work as impressive. Hard physics often looks unconvincing right up to the moment it is not. Microsoft is also not alone in quantum, and the field does not depend on Majorana succeeding: other platforms are advancing, see the types guide and the innovators tour. A genuine topological qubit would be a landmark; the right posture today is curious and patient. Nothing here is financial advice and Microsoft has no link to the QNT memecoin.
Sources and further reading
- Physics World: experts weigh in on Microsoft's topological qubit claim
- Science News: physicists mostly unconvinced
- Fortune: breakthrough questioned by experts
- Converge Digest: Microsoft unveils Majorana 2 (June 2026, company claims)
- Wikipedia: Majorana 1 (background, check primary sources)
Reported as of 2026-10-09. Company roadmaps are targets and often slip. Check each company's own announcements. This page is education, not financial advice, and the QNT memecoin is independent of every company named here.
Frequently asked questions
Did Microsoft build a topological qubit?
Microsoft said so in February 2025, but Nature's editors said the paper's results did not show evidence of Majorana zero modes, and many physicists remain unconvinced.
Why was the 2018 claim important?
A related 2018 claim was later retracted, so researchers look hard at new evidence.
Is there a Majorana 2?
Press coverage says Microsoft unveiled it on June 2, 2026, but its performance claims are the company's own and, per coverage, not yet peer reviewed.
Does this affect other quantum companies?
No. Other platforms progress independently.
Keep reading
- Topological Qubits Explained: Promise and Debate
What are topological qubits? Learn the idea behind Majorana-based protection from noise, why it is so hard to build, and why claims in this area remain debated. - Quantum Error Correction Explained
Qubits are fragile, so quantum computers need error correction. Learn how logical qubits are built and why this is the key challenge. - Types of Quantum Computers: Superconducting, Ion, Photonic and More
A guide to the main ways quantum computers are built, with the strengths and trade-offs of each approach. - IonQ, Microsoft, PsiQuantum, Rigetti, D-Wave and the Rest of the Field
Short profiles of the other major quantum players: what each builds, what they announced, and what to watch.
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