https://physicsworld.com/a/google-aims-for-quantum-supremacy/
This is somewhat interesting news in that Google has been the first to admit they are much further along than a 50 qubit processor. The noise level is a serious issue, but a 120 qubit processor is all that would be required to do the calculations they want.
Microsoft is investing all of its bananas into topological quantum computing, which has one of the best chances of succeeding in producing a quantum computer between 120-200 qubits, which is roughly the requirements for crunching a Theory of Everything and doing almost any useful calculation you can imagine. IBM has a quantum computer they’ve been working on for quite some time, that uses a liquid computer to surround and isolate a chip in the middle from noise, which is capable of both classical and quantum computing. The chip in the middle doing both quantum and classical calculations is the ideal arrangement. That one is really funky physics, but promises to be scalable. However, the Australians have shown it is possible to use silicon, while other attempts include a self-assembling quantum computer and, about all I can say is that it looks like a full scale one will be announced sometime in the next three years.
Building a scalable quantum computer capable of thousands or millions of qubits could be the future for competition, that is, assuming a Theory of Everything doesn’t include uncrackable quantum encryption. Thus far, every supposedly uncrackable quantum cryptographic system has been cracked, and there is no reason to assume larger quantum computers won’t soon be cracking smaller ones. Theoretically, these computers can spit out answers before you finish entering the question.