It’s only a matter of time before quantum computers start solving real-world problems

No, quantum computing did not come of age with Google’s Sycamore, a 53-qubit computer solving in 200 seconds a problem that would take even a supercomputer 10,000 years. Instead, it is the first step, showing that a functional computation can be done with a quantum computer, and it does indeed solve a special class of problems much faster than conventional computers. The hype of quantum supremacy is misleading as it is based on a very narrow definition quantum supremacy; quantum supremacy is one quantum computer beating all classical computers for one specially constructed task. That means that if we are trying to simulate quantum phenomena on computing machines, the only way to compute the quantum world in reasonable time would be to build the machines themselves on quantum phenomena, i.e., quantum computers.It was essentially a thought experiment by Feynman to show why quantum simulations on computers based on classical physics would not work in quantum physics. Classical computers won’tbe replaced by quantum computers; they are a complementary technology.They address a different class of problems than classical computers, particularly those that deal with probabilities rather than definite solutions.