This new edition of the unrivalled textbook introduces the fundamental concepts of quantum mechanics such as waves, particles and probability before explaining the postulates of quantum mechanics in detail. In the proven didactic manner, the textbook then covers the classical scope of introductory quantum mechanics, namely simple two-level systems, the one-dimensional harmonic oscillator, the quantized angular momentum and particles in a central potential. The entire book has been revised to take into account new developments in quantum mechanics curricula. The textbook retains its original style in this new edition: fundamental concepts are explained in chapters, each followed by complements that provide more detailed discussions, examples and applications. - The quantum mechanics classic in a new edition: written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë - As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly - Comprehensive: in addition to the fundamentals themselves, the book contains more than 350 worked examples plus exercises