Indeterminacy and entanglement: The challenge of quantum mechanics

I explore the nature of the problem generated by the transition from classi cal to quantum mechanics, and I survey some of the different responses to t his problem. I show briefly how recent work on quantum information over the past ten years has led to a shift of focus, in which the puzzling features of quantum mechanics are seen as a resource to be developed rather than a problem to be solved. 1 Introduction 2 Indeterminacy 3 Entanglement 4 The variety of responses 5 From bits to qubits.