https://www.theregister.co.uk/2019/10/22/ibm_poopoos_google_quantum_claims/

The esoteric world of quantum computing is all aquiver following a robust blog post from IBM essentially rubbishing claims from Google that it has achieved "quantum supremacy".

The post notes that quantum computing is approaching the limits of classical simulation and there are big questions as to how to evaluate and benchmark system performance. Quantum supremacy is the moment quantum machines begin to do things classical computers cannot.