Entanglement was initially thought by some to be an oddity restricted to the realm of thought experiments. However, Bells inequality delimiting local - havior and the experimental demonstration of its violation more than 25 years ago made it entirely clear that non-local properties of pure quantum states are more than an intellectual curiosity. Entanglement and non-locality are now understood to ?gure prominently in the microphysical world, a realm into which technology is rapidly hurtling. Information theory is also increasingly recognized by physicists and philosophers as intimately related to the foun- tions of mechanics. The clearest indicator of this relationship is that between quantum information and entanglement. To some degree, a deep relationship between information and mechanics in the quantum context was already there to be seen upon the introduction by Max Born and Wolfgang Pauli of the idea that the essence of pure quantum states lies in their provision of probabilities regarding the behavior of quantum systems, via what has come to be known as the Born rule. The signi?cance of the relationship between mechanics and information became even clearer with Leo Szilards analysis of James Clerk Maxwells infamous demon thought experiment. Here, in addition to examining both entanglement and quantum infor- tion and their relationship, I endeavor to critically assess the in?uence of the study of these subjects on the interpretation of quantum theory.

After graduating in mathematics, philosophy, and physics at the University of Wisconsin-Madison, Gregg Jaeger undertook his doctoral work in physics at Boston University under Abner Shimony, with whom he discovered new complementarity relations in quantum interferometry. He currently holds a professorship at Boston University, where he has offered courses in the mathematics, natural science, and philosophy departments. His recent research has focused on decoherence, entanglement theory, quantum computing, and quantum cryptography.

Superposition, Entanglement, and Limits of Local Causality.- Quantum Measurement, Probability, and Logic.- Interpretations of Quantum Mechanics.- Information and Quantum Mechanics.