RT nic carter (@nic_carter)summarizing/paraphrasing Scott Aaronson's comments in conversation with @EliBenSasson just now:- building a useful quantum computer is "merely" a ("staggeringly hard") engineering challenge now- no new fundamental breakthroughs are necessary- scalable error correction was the breakthrough- most important metric is fidelity of 2-qubit gates- progress towards a CRQC should be "continuous"- if there was a showstopper "we would have already noticed it".- if it turns out (in 50 years) ...