I may have mentioned this before but the March issue of First Things has a particularly clear exposition by Stephen Barr on quantum theory. Along the way Barr shows how quantum theory leads some physicists to conclude that there are a near infinite number of alternative worlds, why it is incompatible with physical determinism, and why it is antithetical to materialism.
It's a good article for the layman who knows little about quantum mechanics but would like a simple, basic understanding of its philosophical implications.
The irony of modern physics is that beginning in the early 19th century science in general, and physics in particular, were used as dispositive justifications for a deterministic, materialistic, naturalistic worldview. Science, we were told, had proven that there's nothing to reality but matter and energy, nature is all there is.
Then came the discovery of the world of quantum phenomena and the crucial importance of observers in the twenties and thirties and suddenly the role of mind took on new significance. Physical determinism collapsed along with the idea that matter is the sole component of reality.
The main prop of metaphysical naturalism was now revealing that naive materialism was an inadequate explanation of reality. It was telling us, in effect, that "there are more things in heaven and on earth than we dream of in our philosophy."
Now, in the early years of the 21st century, more and more non-scientists are beginning to grasp the obsolescence of the earlier views. Today, the universe often looks less like a Newtonian machine and more like a grand idea, an idea, perhaps, in the mind of God.
RLC