Of course, Quantum computer is not expected to unfold completely in few years, despite
IBM claims to build a quantum computer with 1000 qubits 2023. A quantum computer requires more Qubits ranging from 1000 to 100,000 to correct errors effectively. But, the problem is how will a large amount of qubits be controlled while it corrects errors. Because a QC with 300 qubits has more state than all the atoms in the universe.
The number 15 was factored with 7 qbits, and 21 with more advanced algorithm and 6 qbits. Well, now 127 qbits cannot bring an improvement, 20 times more qbits and nada. So 1000 wouldn't either. More qbits - same result.
However, every computer face numerical errors and quantum computer is not an exception. But, when qubits are entangled they can form a fresh qubits which can be used to correct errors regarding the brittle nature of qubits, it can be destroyed just from the heat of the environment it is placed. So, one thing that makes QC a threat like i said is that it's under construction and one day it will be established like any other technology.
For solving ECDLP the system must represent 2
256 states. Not only heat, a single neutrino could destroy the state.
The major problem is that people want it to be birthed soon which is impossible and the big tech companies provide such promises to investors so that they can invest more funds into the project hoping for a quick ROI. In the past, people believed that Artificial intelligence will be ready in 1960 as published by
nytimes in 1958 but, it was a false promise, despite all hope lost on AI, it came to conclusion few years ago.
The so-called "AI" from recent years has little to do with intelligence. It is more a form of Artificial Idiocy. The main problem is that meaning seems not transferred physically, at least I haven't heard of a device to detect it. One word can mean a lot, no words can mean a lot, and this is without any physical difference in context. As if there's an additional space of meaning, and one tunes to different parts of it.
It is very useful though, because most people don't mean anything. So no intelligence is needed, advanced idiocy works well.
In conclusion don't underestimate the power of what is known and being worked on. Another thing is, tech companies are getting prepared for QC by building post quantum cryptography. Therefore, if QC is a technology that has failed entirely people won't bother building a post quantum cryptography.
READ SOURCEIt would be great if I'm mistaken, but I doubt. All points towards failure.