And using that imagination, computers were invented. Imagine living in the 1800's; they probably imagined how they are going to talk to other people from another side Of the world? How is mathematics going to be easy? I wish there were some machine or equipment for that

Don't be so negative with things that are not yet adequately realized. It all starts with a theory and a what-if.

It's hard yet to realize since there are only two ways to do quantum computing and you need an expensive device to experiment. It needs to be in a vacuum chamber etc. The human race would get there, for sure. (unless we have destroyed our home, Earth) Lol