Nature published a peer reviewed paper arguing that Microsoft's claims of a quantum computing breakthrough last year are based on bugs in their Python code and selectively choosing which data to base their results on.

The author of the paper claims "I demonstrate that Microsoft's tune-up software is flawed and that coding errors resulted in incorrect statements to peer reviewers"

This is extremely embarrassing for Microsoft and they've pushed back on the paper's claims.

https://www.theregister.com/research/2026/06/24/boffin-claims-microsofts-supposed-quantum-leap-does-not-compute-due-to-basic-python-errors/5260489