Thanks for the correction. I was only reproducing what I read about the topic.

Quantum computers are not better computers. They are good for different tasks. They are good to solve tasks that current computers take very long to compute. It's almost impossible to explain how they work in layman terms, because it's quantum technology, which is complete weird shit. Most likely we will never see quantum home computers, maybe we could see some quantum capabilities added to the normal classical computers, but currently the tech is mostly run in lab environment. Because there's lots of interference that will break the function. Also needs to be supercooled to almost absolute zero. An example of a task that is very tedious for a normal computer but easy for a quantum computer is so called "traveling salesman problem". You have a bunch of cities on a map that you want to visit and you need to compute the most optimal route. This problem is easy to solve, but extremely hard to solve to be sure, that your solution is really the most optimal. For normal computers, the more points you have on the map, the longer it will take to compute. And this growth is probably around exponential, so you get to a point where it's simply not practical to even try to compute it, because it would take weeks, months, years. But quantum computers can somehow calculate all the possibilities at the same time and thus making the total time quite short. At least that's how I understand it. Problem with this is, that current computer security and cryptography is based on this, that it is extremely difficult to calculate some things for normal computers. But there will be a point of development in quantum computing where the quantum computer can break through the best current security in minutes. So new security algorythm will have to be developed, and are currently being worked on.