Ok, I did say "why does this matter to anyone?", and you're right about the land owner, clearly it matters to them. Fair enough.
But you also said that we can care about more than one thing at a time. And while I agree with that up to a point, I think you can't use that mindset all the time.
I made a reply to a very similar response below, (I don't want to spam the thread with repeat comments, so I'll just link to it) https://lemmy.world/comment/21477093
No no, quantum computing is more about using the quantum properties of particles to do computing in ways that you simply can't with traditional computers. If you write your program to accommodate this kind of computing, you can essentially design programs to test all possible outputs simultaneously - a pretty neat trick.
Right now we're talking about photonic computing, simply using photons as the circuitry within a processor rather than electronic circuits using elections.
Though I'm not an expert on either, so I'm probably the wrong person to ask for more information on the subject.