[dwnw]

Nope. Any crypto you can break with a real, physical, non-imaginary quantum computer, you can break faster with classical. Get over it. Shor's don't run yet and probably never will.

You are misdirecting and you know it. I don't even need to discredit that paper. Other people have done it for me already.

[rhubarbtree]

This is incorrect. Whilst you may be sceptical about whether quantum computers can be realised, the theoretical result is sound.

Recent advances in quantum error correction are a significant increase in confidence that quantum computers are practical.

We can argue about timelines. I suspect it is too early for startups to be raising funds for quantum computers at this stage.

Source: I worked in quantum computing research.