I recently had the opportunity to talk to the head of a company which is trying to build quantum computers. It's very obviously a spin off from a university to

I recently had the opportunity to talk to the head of a company which is trying to build quantum computers. It's very obviously a spin off from a university to provide a way to keep their better Ph. D students employed and researching but not on University payroll (i.e. with the various requirements that entails). Basically her opinion was they were 10 years at least away from meaningfully getting beyond 4 practical qubits with their technology, and weren't worried about it because everyone reporting more are using hundreds to thousands of qubits to error correct out to get the 60 or so they report using in calculations (their technology value add was that they could do with a lot less error correction). The overall take away I got was quantum computers aren't "imminent" - they're 30 years away at minimum, probably more. The company exists because it's important basic research, but it's definitely not a "commercial products soon" endeavor - it was basically a way to fund focused research on a particular method.