It only took 308 days, but we just had some new research published in Nature Communications.

It was a completely surprising piece of work; we were able to levitate a tiny silicon cylinder, and make it tick like the hands of the worlds most perfect clock. No physical man-made object has ever rotated in such a perfect way. Our nano-watch only lost one millionth of a second over four days.

This is useful, because we can detect even the tiniest changes to the motion of our little watch-hands, meaning we can shove it places and detect all kinds of interesting, hard to measure things.

You can read Optically driven ultra-stable nanomechanical Rotor here.