What can my homemade quantum computer do?

This video was supported by Screen Australia and Google through the Skip Ahead initiative.

Part 1 is here:    • I made a (useless) quantum computer a...  

f you want to do this experiment at home, you can! It's very simple.
All you'll need is:
- a weak red laser pointer (the type in cat toys are generally safe)
- polarizing film or polarizing filter. If you have polaroid glasses or certain camera ND filters you may already have this. Otherwise it's available on amazon
- half waveplate (the plastic thing) is this one: https://www.edmundoptics.co.uk/f/poly... (λ/2 Retarder Film (WP280))
- You don't need calcite, but if you want to play with it, you can find it on etsy usually. Look for a sample that's exceptionally clear