A couple of years ago I got to push some trapped ion's around in the quantum computer under development at the University of Sussex [0]. Very cool, seeing the glowing ions on a monitor and moving them in 1-micron steps via the cursor keys.

You get to realise how sensitive this stuff is when you hear it took them 3 weeks to track down a single hair that was contaminating their (extensive) vacuum system.

[0] https://www.sussex.ac.uk/research/centres/sussex-centre-for-...