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How capable are modern quantum computers?

 

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How capable are modern quantum computers?


The image above this text is M.C Escher's "Ascending and descending" is basing the Penrose stairs. But that drawing is a very good illustration of the superposition. We can think that the walking men are portraying the atoms, what are put in molecular superposition. That means that when the other series of atoms is giving its energy to other series, the individual atoms would rise in the higher energy level, and the others will go to a lower energy level. In this model, the atoms would deliver energy to the other atom, which oscillates at the same frequency.

So that drawing could use to demonstrate the problems of the qubit. When the energy level of the other atoms is rising, they are losing energy at the same time to the structures. Sooner or later the energy of those atoms is ending. And the problem is that the attempt to increase the energy level of those "tired atoms" from outside makes them oscillate, and lose the information that is stored in them. This is the problem with quantum computers. Theoretically, they are ready to work. But the practical solutions are harder to make than researchers ever imagine. 

If we are thinking that a two-atomic molecule is turned to the qubit, the other atom must put in a higher energy level than the other. And then we should read the data that is stored in that molecule. So do you even imagine, what accuracy that thing requires? What is needed to separate data from individual atoms? 

The fact is that quantum computers are in the level of experimental use. That means that there are many things, that the creators of the system must win if they want to make those systems every-day use, or so good and trustable that they can be used in time or mission-critical systems. The problem is that the qubit must be in absolute stable condition, that it would not lose its data. And the superposition of the qubit is possible to make only in the molecular form of atoms. So that thing requires very high accuracy and making that thing in practice is difficult. 


https://physicsworld.com/a/how-capable-are-todays-quantum-computers/


Penrose stairs: https://en.wikipedia.org/wiki/Penrose_stairs

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