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Starting from basic principles, the book systematically covers both Heisenberg and Schrödinger realizations of quantum mechanics (in this order). The material traditionally presented in quantum textbooks is illustrated with applications which are (or will become) cornerstones of future technologies. The emphasis in the matrix formulation focus the attention on the spin, the most important quantum observable, and paves the way to chapters on quantum information (including crytography, teleportation and computation), on recent tests of quantum physics and on decoherence. Additions and changes found in the second edition include; a more friendly presentation to Hilbert spaces; more practical applications e.g. scanning tunneling microscope (potential barrier); quantum dots (single-particle states in semiconductors); lasers and masers (induced emission); real experiments that have recently provided a qualitative change in the foundations of quantum physics; and an outline of the density matrix formalism as applied to a simple model of decoherence. From reviews of the first edition: 'Daniel Bes clearly understands that accuracy, clarity and brevity ... has therefore made a careful selection of the topics to make an accessible concise book on quantum mechanics for a modern introductory undergraduate course... The claims that this is a modern textbook are well justified by the inclusion of ... the flow of the main ideas is not unbalanced by laborious detail.' Contemporary Physics 'It is concise but covers an extraordinary range of topics, from those typically found in traditional quantum mechanics textbooks ... All this is illustrated with examples that cover a wide range ... provides a large amount of information per page and the selection, extension and balance of topics is adequate for an introductory course.' Mathematical Reviews TOC:1. Introduction.- 2. Principles of Quantum Mechanics.- 3. The Heisenberg Realization of Quantum Mechanics.- 4. The Schroedinger Realization of Quantum Mechanics.- 5. Angular Momenta.- 6. Three-Dimensional Hamiltonian Problems.- 7. Many-Body Problems.- 8. Approximate Solutions to Quantum Problems.- 9. Time-Dependence in Quantum Mechanics.- 10. Entanglement and Quantum Information.- 11. Experimental Tests of Quantum Mechanics.- 12. Measurements and Alternative Interpretations of Quantum Mechanics. Decoherence.- 13. A Brief History of Quantum Mechanics.- 14. Solutions to Problems and Physical Constants.