1. Difficult - this is a pretty easy introduction to quantum computing/physics, so the math hasn't gotten very complicated yet. I guess keeping track of the probabilities when discussing Eve eavesdropping on the quantum bits being distributed was a little confusing.
2. Interesting - the whole section is interesting! I want to try the poloroid experiment, it seems mind-boggling. As for the vectors in the 2-dimensional complex vector space, why do they have complex numbers for the coefficients? This is not obvious yet. It really seems they have only used the magnitudes of those complex numbers, and so real vectors would've worked equally well so far. Ah well, whatever.
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