“The three biggest ones are stability, signal-to-noise ratio...”
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I take it that the quantum error handling problem is included under this? I believe its a fundamental challenge with quantum computing, at this point.
I think so, yes.
I believe he called it "fragility."
The circuit elements have to be kept really cold. I mean, much colder than is needed for superconductivity, which is a quantum phenomenon, but has little to do with quantum computing.
We're talking milli-Kelvins.