Quantum Locking
 

This is pretty cool (see what I did there?).
https://www.youtube.com/watch?v=8GY4...l=TheActionLab

Re: Quantum Locking
 

Whilst incredibly interesting, this is very old news. I'm pretty sure it was in the 1930s that this was discovered and good quality demos of it have been on youtube for well over a decade. it's so common it's regularly done a school science fairs these days.