UCLA quantum physicist @PrinehaN says DARPA just advanced 4 quantum computing companies to its final stage, signaling that the science is solved and now they just have to build it: "The DARPA Quantum Benchmarking Initiative is DARPA's way of saying, 'We're skeptics. Show us that you have what it takes to actually build a fault-tolerant, useful quantum computer.' And that's this objective of a utility scale computer by 2033." "In advancing companies from Stage B to Stage C, DARPA is saying, 'Okay, the technical risk is gone. The science risk is gone.' Now you literally just have to build it." "Those are the companies that have an architecture that scales, algorithms that go with that architecture, and they know which problems they're gonna solve where there's actual value." @UCLA @DCVC