A Modern Approach to Quantum Mechanics, 2/e (Hardcover)

Using an innovative approach that students find both accessible and exciting, A Modern Approach to Quantum Mechanics, Second Edition lays out the foundations of quantum mechanics through the physics of intrinsic spin. Written to serve as the primary textbook for an upper-division course in quantum mechanics, Townsend's text gives professors and students a refreshing alternative to the old style of teaching, by allowing the basic physics of spin systems to drive the introduction of concepts such as Dirac notation, operators, eigenstates and eigenvalues, time evolution in quantum mechanics, and entanglement. Chapters 6 through 10 cover the more traditional subjects in wave mechanics-the Schrodinger equation in position space, the harmonic oscillator, orbital angular momentum, and central potentials-but they are motivated by the foundations developed in the earlier chapters. Students using this text will perceive wave mechanics as an important aspect of quantum mechanics, but not necessarily the core of the subject. Subsequent chapters are devoted to perturbation theory, identical particles, scattering, and the interaction of atoms with radiation, and an optional chapter on path integrals is also included. This new edition has been revised throughout to include many more worked examples and end-of-chapter problems, further enabling students to gain a complete mastery of quantum mechanics. It also includes new sections on quantum teleportation, the density operator, coherent states, and cavity quantum electrodynamics.

《現代量子力學的新方法》第二版以學生易於理解且引人入勝的創新方法，介紹了量子力學的基礎知識，並以內在自旋的物理學為基礎。這本教科書旨在作為高年級量子力學課程的主要教材，給教授和學生提供了一種新穎的教學方式，通過基本的自旋系統物理學來引入Dirac符號、算子、本徵態和本徵值、量子力學中的時間演化以及纏結等概念。第6至10章涵蓋了波動力學中更傳統的主題，如位置空間中的薛定諾方程、諧振子、軌道角動量和中心勢能，但這些主題是以前幾章所發展的基礎為動機。使用這本教材的學生將認識到波動力學是量子力學的一個重要方面，但不一定是該學科的核心。隨後的章節專門介紹了微擾理論、相同粒子、散射以及原子與輻射的相互作用，並包括一個關於路徑積分的選修章節。本版全面修訂，增加了更多的例題和章末問題，進一步幫助學生完全掌握量子力學。它還新增了關於量子傳輸、密度算子、相干態和腔量子電動力學的新節。