Martinis has been working on a quantum supremacy demonstration chip for a few years already, and it's not unrealistic that they will make it work in the next 12

Martinis has been working on a quantum supremacy demonstration chip for a few years already, and it's not unrealistic that they will make it work in the next 12-18 months. The term "supremacy" is a bit misleading though as it suggests that general purpose quantum computing might be around the corner, which it is not. The "supremacy" algorithm is designed to demonstrate -for the first time- a quantum processor that runs an algorithm which cannot (or just barely can) be simulated on a classical computer (due to the number of qubits in the system). The circuit they're using for this contains around 45 qubits (which is enough to make a classical simulation very hard) and the result of the algorithm that runs on it can be verified using a conventional supercomputer (as otherwise it would be hard to prove that it actually did what it's meant to do). So all in all this is a very clever way of demonstrating the possible supremacy of a quantum computer with the currently available means of technology, but it's no general purpose quantum computer.