**Scott Aaronson**: *Quantum Supremacy: The Gloves Are Off* https://www.scottaaronson.com/blog/?p=4372: 'does IBM’s analysis mean that “quantum supremacy” hasn’t been achieved? No, it doesn’t—at least, not under any definition of “quantum supremacy” that I’ve ever used. The Sycamore chip took about 3 minutes.... three minutes versus 2.5 days is still a quantum speedup by a factor of 1200. But even more relevant, I think, is to compare the number of “elementary operations.” Let’s generously count a FLOP (floating-point operation) as the equivalent of a quantum gate. Then by my estimate, we’re comparing ~5×10^9 quantum gates against ~2×10^20 FLOPs—a quantum speedup by a factor of ~40 billion.... The broader point is that neither party... denies that the top-supercomputers-on-the-planet-level difficulty of classically simulating Google’s 53-qubit programmable chip really is coming from the exponential character of the quantum states in that chip, and nothing else...

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#noted #riseoftherobots #quantum #quantumcomputing #2019-10-28
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