# What is the diference between classic probabilities and quantum probabilities? [closed]

So, I'm really trying my best to understand how quantum computers work.

This is how I think they work:

1. There is a set of qubits;
2. Then an algorithm is put in action by the use of quantum gates that entangle these qubits and rotate them in a way to produce equal probabilities for each case (like for example in a big list of items);
3. At this moment the way I visualize things is like a series of ball spheres that individually act as layers that have some information relative to each case, but combined they are like a single ball sphere that has more information on it (something like photoshop layers, but in 3d);
4. Until this point everything seems like something that I could build in a classic computer, the difference is that in everything I read it is told to me that quantum computers do not go through all of the possibilities, but only some, as they are probabilistic. Ok, but if the probabilities start by being equal to each case, how can one find the right cases?
5. I read that it is by the use of phase and interference, and this is where there is lack of information and where I stop to understand how quantum computers work;
6. And then, in the end, qubits are collapsed so we get actual values in ones and zeros coming from those previous probabilities;

Please, try to explain with simple terms and examples like I just did, more than this will be like what's out there, complicated and not useful, or to simple and repetitive.

It's about time someone explains quantum computing in simple ways. Why complicate what's not so complicated? If one is unable to explain how things work, and sometimes people actually working on the field, how can this technology progress? Still, I will appreciate any efforts to help me understand this technology.

If you want to use formulas and functions go ahead, but please, completely explain what they do...

• The thing about quantum computing is that the English language is neither precise nor sufficient to explain it to a layman. The bare minimum you need to learn the subject is linear algebra and some high school physics. And we don't have sufficient bandwidth to provide you extensive courses on those topics, here. Could recommend a few textbooks though. Dec 11 '19 at 22:03
• I don't need to understand all concepts revolving around this subject, I just need some simplification of what actually happens... at least on this part relative to the probabilities. I will not dispense your books recommendations though... Dec 12 '19 at 0:03
• Every subject requires some foundational concepts. You can't really understand long division without knowing addition/subtraction. As for textbook recommendations, there are already plenty on this site. Try googling a bit. Dec 12 '19 at 9:01
• I know all fundamental concepts by reading Wikipedia, search images on google, and watching very explanatory videos on youtube. There is only a lack of explanation on this probability part. I already understand the in-phase and out-of-phase part of the waves. But I what to go from these joining and cancelation of some parts of the waves to how one arrives to a skewed result towards the right answer/case. Dec 12 '19 at 22:16