D-WAVE UNHAPPY

D-Wave - from Fast Company.

Sure, many people working in quantum computing will be unhappy about NVIDIA CEO Jensen Huang's comments at CES in Las Vegas. However, he is correct and maybe even too optimistic about how long it will take to get something meaningful from quantum computing. Practical quantum computers are not coming soon, not even in the distant future. All ideas used in different approaches to quantum computing are flawed. They ignore the fact that noise is always present in any quantum device. Noise-free devices cannot exist because the surrounding quantum nature is probabilistic and will always generate noise. Noise cannot be removed because any device that attempts to remove noise can only add its noise. It would also have to perform a minus noise operation on something random that has already happened in the past. This simple consideration voids all attempts at quantum error correction algorithms. There is no quantum error correction; it cannot exist. At the fundamental level, nature behaves in its own way. We don't even know why it is that way. We can build theories and derive equations that sometimes even agree with nature. Eventually, they will be replaced with something more advanced and accurate. It will always be like that. Take it or leave it. And where exactly would you go?

All quantum gates suffer from the noise issue. Noise from a previous gate will be added to the noise generated by the gate and moved to the next gate. This operation can only increase noise and never reduce or eliminate it. After several operations, the expected data will drown in noise and become unreadable.

You can check my previous writing on the subject here or here.

#quantumcomputing #quantumgates #noise #DWave