A lot of companies say they are near QCaaS - quantum computing as a service, on the cloud. In reality, they can't do this until they have a working quantum com

A lot of companies say they are near QCaaS - quantum computing as a service, on the cloud. In reality, they can't do this until they have a working quantum computer of an interesting size. For now, it's limited to toy-size QCs, which can be simulated faster and cheaper using an ordinary computer. So if they are on a cloud server, it's more for curiosity value only. They aren't actually useful. There's a lot of buzz and hope and money going into it, but nobody knows with certainty if it's even possible to build one of a useful size. The "quantum supremacy" claim which happened already was genuine and deserves accolades, but it turns out only to be useful on a very contrived kind of problem. The clever part, in a way, was figuring out a suitably contrived problem, to show that quantum supremacy is technically possible without resulting in a useful quantum computer, and it doesn't run any of the standard quantum circuits.