Did Microsoft's 2025 quantum leap arise from clumsy code? The company denies it

Microsoft's path towards a commercial quantum supercomputer by 2029 may have encountered an unexpected obstacle due to some lines of Python code. A critique published in the scientific journal Nature claims that simple software errors have essentially generated the milestone announced by the company for 2025 regarding topological qubits based on Majorana particles.

Topological quantum computing, the route chosen by Microsoft for its research, is based on the creation and control of so-called Majorana zero modes, quasiparticles that theoretically offer much greater error resistance compared to the superconducting qubits used by rivals like Google and IBM. However, proving that they have actually been realized requires the analysis of vast amounts of data on electrical conductance to isolate a specific parameter known as the topological gap.

Due to the sheer volume of data involved, physicists rely on customized software pipelines to process the results, and this is where Python scripts come into play. According to the critique, Microsoft's data processing software contained basic programming errors that skewed the published results. By mishandling data arrays or applying incorrect logic, the program allegedly discarded noisy or contradictory measurements, only allowing those that supported the thesis of the topological gap to emerge.

The researchers behind the critique argue that this would invalidate the results, suggesting that the alleged quantum leap was a false positive generated by defective code, not the result of a real physical discovery. A conclusion that, if confirmed, would overturn one of the most discussed scientific announcements in the entire technology sector in recent years.

Microsoft, for its part, firmly rejects the accusations. The Redmond company has termed the critique a minor anomaly rather than a significant flaw, admitting a possible oversight in the data analysis scripts but denying that this alters the physical reality of the conducted experiment. Just a few weeks ago, Microsoft introduced Majorana 2, the new quantum processor that has pushed the company to advance its timeline for a commercial supercomputer from 2035 to 2029. However, the new accusations reopen a wound that has not fully healed: Microsoft's quantum division had already faced a similar crisis in 2018, a precedent that could make the new accusations particularly delicate, with the roadmap for 2029 facing potential delays.