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,…