"This book is the second volume in the series New Era Electronics, a compilation of lecture notes defining the important concepts tied to the electronics transition happening in the 21st century. Quantum communication is introduced in this volume through the coverage of relevant, basic concepts of quantum mechanics and the introduction of quantum elements of a quantum optical communication system. Also included is a quantum description of electromagnetic fields and its interaction with atoms to generate, store, measure and control quantum optical information encoded onto optical fields. By taking a conceptual and less mathematical approach to quantum optics and quantum information, this book becomes accessible to broader audiences and engineers working actively in the technical field. The reader is only required to have a basic understanding of undergraduate linear algebra. Sample Chapter(s) Preface Contents: Introduction and Basic Concepts: Introduction Introduction to Quantum Mechanics Dirac Notation Density Operator Commutation Relation Entanglement Photons and Atoms for Quantum Optical Information: Quantum Electromagnetic Fields Optical Resonators Photon Correlation Atoms Light-Atom Interactions Strong Light-Atom Interactions Two-photon Transitions in Three-Level Atoms Dynamics of Density Operator Interaction of Light with Atoms in Free Space Quantum Communication: Quantum Key Distribution Quantum Teleportation Quantum Optical Memory DLCZ Entanglement Distribution Protocol Long-Distance Entanglement Distribution Quantum Optical Networks: Implementation and Applications Readership: Advanced undergraduates and junior graduates in Electrical Engineering, Chemical Engineering, Material Engineering and Physical Sciences."