They keep comparing the power of a 300-qbit quantum computer to a conventional computer the size of the universe, but they ought to be looking at how it compares to the universe itself.

It's been estimated that a quantum computer with around 512 qbits could represent the universe.

What does that mean exactly? I think of it in terms of a simulation equivalent. You know, the Matrix Scenario. You can create and maintain a universe with 512 qbits, by definition at a resolution equivalent to the "real" universe.

It's an exponential scale, true, but all they have to do is add atoms to climb it. Not much longer to 512, I think.

As for how you interface to it, it's kind of a moot point when "it" is the universe. It makes its own interface. Don't worry about it.