A new & exciting approach to the basics of quantum theory this undergraduate textbook contains extensive discussions of conceptual puzzles & over 800 exercises & problems Beginning with three elementary 'qubit' systems the book develops the formalism of quantum theory addresses questions of measurement & distinguishability & explores the dynamics of quantum systems In addition to the standard topics covered in other textbooks it also covers communication & measurement quantum entanglement entropy & thermodynamics & quantum information processing This textbook gives a broad view of quantum theory by emphasizing dynamical evolution & exploring conceptual & foundational issues It focuses on contemporary topics including measurement time evolution open systems quantum entanglement & the role of information