Abstract
The second lesson led to a more quantitative clarification of the notion of entanglement by introducing the Schmidt decomposition formalism and discussing the link between entanglement and non-locality, which naturally led to a rapid analysis of Bell's inequalities and their significance (the impossibility of interpreting quantum correlations observed in entangled systems by classical "hidden variable" arguments). The lesson ended with an analysis of the important role of entanglement in quantum measurement.
