Quantum supremacy using a programmable superconducting processor
Google's team uses a 53-qubit programmable superconducting processor (Sycamore) to perform random quantum circuit sampling, a task chosen to be classically hard. They report sampling the output of a pseudo-random circuit in about 200 seconds, estimating that a leading classical supercomputer would need an impractically long time for the equivalent task, thereby claiming the first demonstration of quantum computational supremacy.