Microsoft’s Majorana 2 Quantum Chip: Unproven Topological Qubit Claims and Skepticism

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Microsoft’s Majorana 2 Quantum Chip: Unproven Topological Qubit Claims and Skepticism

Clip title: Update: Microsoft Unveils the Majorana 2 Quantum Chip! Author / channel: German Science Guy URL: https://www.youtube.com/watch?v=FgYGu7s7kiQ

Summary

Microsoft has unveiled its latest quantum chip, Majorana 2, claiming dramatic advances that could lead to the first scalable topological quantum computer by 2029, halving their original timeline. This ambitious announcement, however, faces significant skepticism from the scientific community, particularly given the controversies surrounding its predecessor, Majorana 1, which was criticized last year for contradictory statements and flawed data. The core of Microsoft’s approach lies in developing topological qubits, specifically utilizing the theoretical Majorana state. These qubits are designed to be inherently more stable and protected from external disturbances compared to conventional qubits, thereby reducing the need for extensive error correction. The Majorana state is conceptualized as splitting a particle into two spatially separated halves, offering enhanced information protection. A critical challenge with this approach, though, is that Majorana particles currently exist only in theory, and their existence has not yet been definitively proven experimentally.

The purported breakthrough with Majorana 2, detailed in a recent preprint, involves the use of lead instead of aluminum as a superconducting layer, which Microsoft claims has widened the energy gap of the quantum chip. This change reportedly extended the “parity lifetime” – a measure of how long certain electron states persist – from milliseconds to an impressive 20 seconds, a thousand-fold increase over Majorana 1. Microsoft then extrapolates this parity lifetime directly to the overall lifetime of its qubits, asserting that this significant improvement positions them to achieve a scalable quantum computer by 2029.

However, Dr. Henry Legg, a quantum physicist who previously criticized Majorana 1, has published a new paper in Nature disputing Microsoft’s latest claims. Legg highlights several methodological flaws, stating that the research doesn’t meet physical standards and that the results may not be reproducible across multiple devices, suggesting they could be mere coincidence or noise. He critically points out that the “topological gap protocol” (TGP) used by Microsoft to measure the energy gap is deeply flawed, citing basic coding errors and extreme sensitivity to parameter changes, which can lead to false positives for the presence of a topological gap. Furthermore, Legg argues that Microsoft has not released its raw data, only favorable outcomes, potentially skewing the interpretation of results towards topological states when other phenomena, like quantum dots, might be responsible.

A pivotal point of criticism is Microsoft’s equating the extended “parity lifetime” with actual qubit lifetime in a superposition state. Legg clarifies that the 20-second lifetime observed is for classical-like states (zero or one), not the simultaneous zero and one states (superposition) that define a true quantum bit. If only classical bit-like states are maintained for 20 seconds, this is still extremely short compared to classical computer bits, which last for years. This distinction is crucial, as demonstrating extended superposition lifetime would constitute a genuine breakthrough for quantum computing. Other scientists echo Legg’s concerns, noting a history of unreliable claims from Microsoft in this field. The video concludes by emphasizing the importance of prioritizing high-quality, transparent scientific research over PR-driven hype, as misleading claims can ultimately harm the integrity of science itself.

Video Description & Links

Description

Microsoft has unveiled the new version of its quantum chip: Majorana 2. The advances in research are said to be so dramatic that Microsoft aims to unveil the first topological quantum computer as early as 2029—twice as fast as previously planned! But the breakthrough isn’t as dramatic as Microsoft claims. On the contrary: Just a year ago, Majorana 1 caused quite a stir in the scientific community, partly due to contradictory statements and flawed data. And with Majorana 2, there are once again some pretty bold claims being made. Of course, I looked into this and spoke with Dr. Henry Legg, an expert from the University of St. Andrews who had already exposed problems with Microsoft’s claims last time. In this video, we’ll clarify what supposed breakthrough Microsoft has achieved with Majorana 2— and why it’s still facing such fierce criticism.

This video was produced by my editorial Team. Editorial staff: Lukas Laroche, Tabea Desch, Jacob Beautemps; Editing: Sören Rensch, Aron Kamenz & Romy Gruetter

Chapter 00:00 Introduction 01:00 Quantum Computer 02:54 Problems with Qubits 05:35 Majorana 1 & 2 18:48 This Big HURDLE 13:36 Conclusion

Sources
Source 1: https://www.nature.com/articles/d41586-026-01788-y
Source 2: https://www.forschung-und-wissen.de/nachrichten/physik/microsoft-zeigt-mit-majorana-2-stabileren-quantenchip-133711257
Source 3: https://www.scientificamerican.com/article/microsofts-upgraded-majorana-quantum-computing-chip-fizzles-with-physicists/
Source 4: https://www.quarks.de/technik/faq-so-funktioniert-ein-quantencomputer/ Source 5: https://azure.microsoft.com/de-de/resources/cloud-computing-dictionary/what-is-a-qubit Source 6: https://www.chemie.de/lexikon/Absoluter_Nullpunkt.html Source 7: https://www.spektrum.de/pdf/ist-der-microsoft-durchbruch-keiner-spektrum-die-woche-9-2025/2240288 Source 8: https://news.microsoft.com/source/features/innovation/microsofts-majorana-1-chip-carves-new-path-for-quantum-computing/ Source 9: https://www.forschungsfabrik-mikroelektronik.de/de/fokusthemen/next-generation-computing/quantencomputing.html Source 10: https://de.statista.com/statistik/daten/studie/1198523/umfrage/entwicklung-des-marktpotenzials-fuer-quantencomputer/
Source 11: https://www.fraunhofer.de/de/forschung/aktuelles-aus-der-forschung/quantentechnologien/quantencomputing.html
Source 12: https://www.ibm.com/de-de/topics/qubit Source 13: https://arxiv.org/pdf/2606.03884
Source 14: https://www.nature.com/articles/npjqi20151
Source 15: https://news.microsoft.com/source/emea/2026/06/microsoft-stellt-majorana-2-vor/?lang=de
Source 16: https://www.spiegel.de/wissenschaft/majorana-2-microsofts-neuer-quantenchip-rechnet-mit-teilchen-deren-existenz-unbewiesen-ist-a-9448ce40-9354-4bcf-9b42-8c2f26a50909
Source 17: https://bsky.app/profile/henrylegg.bsky.social/post/3mndbin46xs2z
Source 18: https://www.nature.com/articles/d41586-025-00683-2
Source 19: https://www.ibm.com/de-de/topics/quantum-computing Source 20: Contact with Dr. Michael Wimmer Source 21: https://www.heise.de/news/Microsoft-bezeichnet-neuen-Majorana-Chip-als-Durchbruch-fuer-Quantencomputing-10288761.html Source 22: https://arxiv.org/abs/2502.19560 Source 23: https://www.nature.com/articles/s41586-026-10567-8 Source 24: https://www.science.org/content/article/doubling-down-controversial-claims-microsoft-accelerates-quantum-computing-plans Source 25: Interview with Dr. Henry Legg Source 26: 41586_2024_8445_MOESM2_ESM.pdf Source 27: https://www.spektrum.de/magazin/topologische-quantencomputer/1959658

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Microsoft's Majorana 2 Quantum Chip: Unproven Topological Qubit Claims and Skepticism

Microsoft’s Majorana 2 Quantum Chip: Unproven Topological Qubit Claims and Skepticism