QC is here in theory, but it is not practical for anything - the experiments so far were only intended to prove that the thing was an actual quantum computer in the complexity theory sense. But it is impossible to actually use Google's device or the one in China to compute anything at all, even something like factoring 4 using Shor's algorithm is beyond the current capabilities.

There is perhaps some more debate about D-Wave's device,both its status as a QC and its usefulness.

The X-15 has recorded 7,274 km/h airspeeds. I'm no airspeed record expert but did some reading.

Exactly. That would be the point.

I mis-spoke. 4.5 hours:

"U.K.-based Reaction Engines is developing technology for Synergetic Air-Breathing Rocket Engines (SABRE), which could one day allow aircraft to fly up to five times faster than the speed of sound — that’s Mach 5 or 3,836 miles per hour.

At that speed, hypersonic flights between London and Australia could be over in just four-and-a-half hours."

https://www.cnbc.com/2019/04/08/hypersonic-flight-technology...

Google just announced they plan to have a million qubits in less than 10 years. They’ve not yet demonstrated the ability to go past 100.

I work in this field, and I would say anything between 20% and 70% percent of my colleagues believe that useful error corrected qubits will exist in less than 10 years (depending on what exactly you ask). So I guess the answer is yes, there are respected scientists that would wager that we will have enough useful qubits for interesting chemistry simulations in 10 years.