3 ms·
My belief in achieving actual quantum computing is going down as noise in qbits goes up Digital computers were much easier than that. Make it smaller, make a l
by raverbashing 1y ago
My belief in achieving actual quantum computing is going down as noise in qbits goes up
Digital computers were much easier than that. Make it smaller, make a larger number of it, and you're set.
Quantum computers complexity goes up with ~ n^2 (or possibly ~ e^n) where n is the number of qbits
At the same time, things like d-wave might be the most 'quantum' we might get in the practical sense
- analog31 1y agoIt turns out that error correction was easy on digital computers, and was essentially a solved problem early in their development. In fact, "noise immunity" is arguably the defining feature of a digital system. And error correction can happen at each gate, since there's no reason to propagate an indeterminate number.
- Der_Einzige 1y agoExcept quantum error correction algorithms that are good don’t exist and probably theoretically never can exist: https://spectrum.ieee.org/the-case-against-quantum-computing https://spectrum.ieee.org/the-case-against-quantum-computing
- _bypa 1y agoThe current best one- and two-gate errors are well below 0.01% and going down with every generation of chips. See: https://ianreppel.org/quantum.html https://ianreppel.org/quantum.html There are no theoretical reasons QEC can't exist. In fact it already does. Is it already good enough for universal fault tolerance? No. But then again no one said it would. We are slowly getting closer every year. In his book, Dyakonov offers zero solid reasons other than "it's hard" and thus likely not possible. That's just an opinion.
- analog31 1y agoI took a QC course, and have done some reading, but am hardly an expert. But my impression has been: "This is analog computation." To reinforce the similarity, the error level of analog computers can be improved by running many of them in parallel.