Quantum computing has long lived in the realm of lab demos and bold PowerPoint slides, but two of the industry’s biggest players now say the first truly useful machines are less than five years away.

This is an updated version of a story first published on Dec. 3, 2023. The original video can be viewed here. Artificial intelligence is the magic of the moment but this is a story about what's next, ...

Amid some scepticism, many say the machines can now achieve results beyond the capability of traditional computers ...