There is a rumor that a team of researchers at Google led by John Martinis have performed a calculation on a Quantum Computer in three minutes and 20 seconds that would have taken Summit, the most powerful conventional supercomputer in the world, 10,000 years to perform. The rumor started when a paper stating that was posted by the Google team, apparently accidentally, on a NASA website and then quickly taken down. It's not clear exactly what the calculation was about, they just said it “marks the first computation that can only be performed on a quantum processor". My guess is it was probably a weird function of some sort that would not be of much use to a scientist or engineer, but even so if true it would be a first proof of concept and be earthsharing. I suppose they want to check and recheck their work before they make a official announcement this important and that's why they took the article down.
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