This video was sponsored by Screen Australia and Google Australia through the SkipAhead Initiative.
Thank you Kathy for the beautiful animations! https://kathysarpi.com

Part 2:    • What can my homemade quantum computer...  

If 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