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Peter Shor addressed criticism #5902.
#5902·Rolf LandauerHistorical profile, April 1994·AI-assistedA quantum computer could never run long enough. Its quantities vary continuously, like those of an old analog computer, so small errors pile up and can’t be corrected the way a classical computer corrects a slipped bit: you can’t even look at a quantum state to check it without disturbing it.
Quantum errors can be corrected without looking at the data. Spread one qubit over nine, tied together so that checking how they relate to each other shows whether one of them went wrong, and how to undo it, without revealing what the qubit holds.