Will quantum computers ever become practical - by Steve Baker - Quora Question Review

This document contains a review of the answer by Steve Baker on the question in Quora: "Will quantum computers ever become practical"
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To order to read all the answers select https://www.quora.com/Will-quantum-computers-ever-become-practical

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Reflection

1. Answer Review

Perhaps - but please don't go away with the idea that you'.ll have a quantum computer on your desk, and it'.ll let you play some REALLY kick-ass video games.

That'.s not how this works.

That is not an issue, assuming a QC performs what it is supposed to do.
Firstly, a quantum computer has to be cooled to near absolute zero - that can'.t happen for a device that an average person could own.

Secondly, a quantum computer IS NOT just a very, very fast general purpose computer…in my opinion, they shouldn'.t be called “computers” at all - because that confuses people into thinking that they are.

That is not an issue, assuming a QC performs what it is supposed to do.
In truth, these devices are amazingly fast at some VERY specific tasks - and are completely unable to do anything else.
Both are very important considerations.
The problem is you should at least give one example to support each claim.
So if you need a fast solution to factorizing large numbers (something that would be handy for code-breaking) - or if you need to solve “The Travelling Salesman Problem” in record time - then a quantum computer would be exceedingly useful.
To factorize large number "n" in principle a Quantum Computer can be used. The main reason is because there exists an algorithm, called "Shors Algorithm" which can be used to solve this problem. Specific the part, which is called Fast Fourier Analysis.
One reason is that the solution, called Periodicity, which is displayed when the QC is stopped, is actual a wrong solution. That means that the product of prime1 (obtained) and prime2 (obtained) is not equal to n.
The second reason is that the solution displayed can be invalid, i.e. contains an error. This error can only be solved by using a complex error correction scheme, which by itself also be the cause of additional errors. It should be mentioned that each calcultion by itself can be the cause of such an error.
For more information select this link: Shor's Algorithm

To solve “The Travelling Salesman Problem” on a QC requires a specific algorithm that can be executed on a QC. As far as I know such an algorithm does not exist.
For more information select this link: test 1 test test 2

But for any general-purpose thing that you'.d normally think of using your computer for - they are 100% useless. Quantum computers are massively over-hyped and almost universally mis-understood.

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Created: 1 June 2022

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