Amazon and QuEra are promising useful, error-corrected quantum computing by 2028, a timeline most experts would call aggressive.
The two companies set a joint target of 2028 for practical quantum error correction. The milestone requires building logical qubits: bundles of physical hardware qubits that store information redundantly and monitor each other for errors. Most researchers currently place that milestone five to ten years out. The same wave of announcements also included an updated trapped ion processor and a revision of some earlier quantum supremacy claims, after classical algorithms gained ground.
Error correction is the gating problem for nearly everything interesting that quantum computers could theoretically do. Current hardware is too error-prone to run the algorithms where quantum has any real advantage. Compressing that timeline by even a few years would reorder the competitive landscape for the companies and governments that have spent heavily to get there first.
Quantum roadmaps have a long history of looking different two years later, and the simultaneous supremacy downgrade in this same news cycle is worth keeping in mind.