How does quantum levitation work?

Probably everyone here knows this already, but: It doesn't. That video is a viral advertisement for a computer game.

[EDITED to add:] Ooops, excuse me. I jumped to conclusions about what video it was without actually checking. My claim above is bullshit. There is a famous Youtube video showing "quantum levitation" that's a totally fake viral advertisement, but that isn't it, and to the best of my knowledge everything in the video vallinder linked to is genuine.

Many apologies.

(If anyone's feeling public-spirited, I would suggest downvoting my comment to -2 or thereabouts, perhaps after waiting a few hours so that those who read my original comment have a chance to see the retraction. And no, the foregoing is not motivated by an expectation that without such an invitation I'll get downvoted more and sooner :-).)