Thanks to quantum entaglement, quantum computers can search for pathways in the processor simultaneously, making it potentially much better than classical computers. Not only for searching purposes, but also when looking for potential solutions. Seeing that applied to a computer, while keeping in mind that there is something related to quantum mechanics being applied there is fantastic.

I think it would be the first case of applying quantum mechanics directly into the world (no secondary effects, like superconductivity). It would be a computer that actually thinks in quantum, which would broaden our understanding about it much more, when applying it practically.