It&#x27;s very difficult to explain the quantum mechanics without math, and most of the &quot;explanations&quot; without math are misleading or plain wrong.<p>This is a usual misconception that I saw a few times before. I&#x27;ll repot an old comment that I made in a similar article (with some minor changes):<p>Quite the opposite, the quantum version of the word needs more process power instead of less process power.<p>When you use Classic Mechanics, you only need to &quot;compute&quot; one trajectory.<p>With Quantum Mechanics the system may have a many choices, and you must keep the details of all the possibilities. The easy case is a qbit that only has two choices. But if you have a few qbits nearby, they may interact and now you must &quot;compute&quot; the 2^n possibilities. This is why if we can ever build a quantum computer, it would be exponentially more powerful than a classic computer.