> I can make a random number generating device with as many degrees of freedom as you like by producing a bunch of vertically polarised photons and measuring th

> I can make a random number generating device with as many degrees of freedom as you like by producing a bunch of vertically polarised photons and measuring their horizontal polarisation. Unless I misunderstand you, this is simply not true. Your device will be exceedingly easy to model, it's just a simple sum of i.i.d. random variables and subject to central limit theorems. (While humans definitely aren't.)