The catch is in justifying spending the resources needed to take this from the lab to mass production. No company is willing to invest hundreds of billions that would be needed when they can keep squeezing a bit more performance out of silicon at a lower investment. That’s why this sort of stuff requires state level funding, and now that US is cutting China off from western chips, there’s a really big incentive to provide that sort of funding.
The catch is in justifying spending the resources needed to take this from the lab to mass production. No company is willing to invest hundreds of billions that would be needed when they can keep squeezing a bit more performance out of silicon at a lower investment. That’s why this sort of stuff requires state level funding, and now that US is cutting China off from western chips, there’s a really big incentive to provide that sort of funding.