DavidH
ACK! Quantum consciousness is not a road I want to travel willingly ( I believe that is totally Woo-woo) , but the fact is that the process of observation will alter the state of the cat. Superpositions never survive an act of measurement. I brought the issue to light not because I embrace it ( in the greater sense ) rather because some people as, I stated, do ( you needed to include the statement ," but not in the witchcraft kind of sense.").This area of query has more to do with metaphysics, epistemology and religious arguments then I feel comfortable with. What I meant is that there exists an "editeritorialization" in the outcomes by simple means of how we choose what to measure and seemingly that can affect the results of our investigations. I think that maybe your tussling with realism and not probability which is the stuff of QM.
The error of this mode of thinking I believe is the adherents claim that the phenomenon at atomic levels can and does translate to macroscopic scale. There are those who believe in a twisted kind of solipsism, that the universe did not exist until "we" were there to observe it. Your observation that the state of the cat and box does not need human observation to be real I believe to be correct, but the state cannot be determined without observation or measurement. Paul Davies' ( with a religious axe to grind ) view states that reality has an observational reliance I.E. that the matter and galaxies in recent observations by the Hubble telescope did not exist until we saw it. That is so at odds with any empirical model of science that I find it on a par with astrology. There are however maths (according to Davies) that prove if not the correctness of the idea then at least it's probability. That QM is a study of probability, it must allow even this extreme case. Hawking theorizes that given enough time that black holes will evaporate, the problem is not that he's wrong but rather it would only occur after the proposed lifetime of the universe.
The double slit experiment when subject to the constraints of one photon at a time thru one slit will exhibit what some call "self-interference". What is true is that let the experiment run and the detectors will get a shotgun kind of pattern that mimics the diffraction pattern with both slits open.So no you don't get refraction you get a particle like behavior but the distribution correlates to the interference pattern.
Sorry for not getting back .....was at a Pub all day : )..caveat 7 beer post