Now Dr Troyer and his colleagues have re-run the analysis, this time using the most up-to-date D-Wave system available. In a paper posted to arXiv, an online repository, they report that, on average, there is still no sign that D-Wave’s machine offers a performance boost. Averages may disguise many things, and there are cases in which the D-Wave device is up to ten times faster than an ordinary chip. But there are also cases in which it is around a hundred times slower. And, tellingly, while both the classical and quantum machines get slower as the problems they are asked to solve become more complicated, they seem to slow down at roughly the same speed.
Google’s Quantum Artificial Intelligence Lab, which has been playing around with one of D-Wave’s machines, published some thoughts of its own. It admitted that non-classical machines seem to be able to match the quantum device’s pace.
It seems that current generation of D-Wave quantum computers doesn’t offer a performance boost compared to classical machines. Still, “Quantum Artificial Intelligence Lab” sounds cool!