sen-no-sen wrote:And in the Copenhagen interpretation, chance plays a role, so if there was ever non-determinism, that would not guarantee our free will, however.
Free will is a concept to be dusted off and should be replaced by the notion of "degree of free will", in the same way as intelligence or consciousness.
To say that a rabbit is endowed with intelligence is one thing, but that does not tell us about its level of intelligence, hence the notion of degree.
To stay in the subject John Conway et Simon kochen we developed a fairly relevant free will theorem:
http://www.lifl.fr/~jdelahay/dnalor/LibreArbitre.pdf(For Science article).
"if we have free will, so do elementary particles" ... the simplest solution is that no one really has free will - which is not incompatible with the absence of determinism. A quantum measurement on a particle is not determined (in the sense that in most cases, one cannot prepare the system in a state where one is certain of the measurement), but that does not mean either that the particle "choose freely"!