I think the first real applications will be, well, simulations of quantum systems. Right now classical supercomputers cannot model complex molecules, but are st

I think the first real applications will be, well, simulations of quantum systems. Right now classical supercomputers cannot model complex molecules, but are still better than quantum computers, where you have to take care of the logical qubits they provide. Modelling this can help finding better fertilizer, new drugs, etc.