The governments, big companies (list of quantum processors) and smaller ones are in the competition of building bigger and bigger quantum computers.
Not unexpectedly the number of qubits of those quantum computers seem to double every year but those qubits are noisy qubits. What is a more meaningful metric is the number of error corrected qubits and some sources say that we need 100 noisy qubits to simulate one error corrected qubit.
Besides the error corrected qubits there are other substantial hurdles that need to be passed to come to a universal quantum computer that can do something useful (see Why Will Quantum Computers be Slow?)
I read quotes like (source GOOGLE, ALIBABA SPAR OVER TIMELINE FOR 'QUANTUM SUPREMACY):
Intel CTO Mike Mayberry told WIRED this week that he sees broad commercialization of the technology as a 10-year project. IBM has said it can be “mainstream” in five.
So when might we actually expect the first universal quantum computer that can do something useful outside the academic world ?
With useful I mean that brings real value (e.g. commercial application) and that cannot be done with same efficiency using existing classical computing algorithms/models.
I have deliberately mentioned outside the academic world as obviously currently pure by their existence the current quantum computers are useful for the theoretical computer scientist, quantum physicist, quantum specialist, ...
What currently interests me more is the usefulness of the outcome of this quantum algorithm for real world problems (e.g. cracking an actual key, designing a new molecule with specific characteristics, finding the optimal solution of an actual problem, recognizing real images, ....)