All three books you mentioned are widely regarded as excellent resources for understanding quantum mechanics, but the choice ultimately depends on your personal preferences and background knowledge. Here's a brief overview of each book:
"Introduction to Quantum Mechanics" by David J. Griffiths: This book is a popular choice for undergraduate students and provides a gentle introduction to the subject. It covers the fundamental principles of quantum mechanics and includes numerous examples and exercises. Griffiths' writing style is clear and accessible, making it a good starting point for beginners.
"Modern Quantum Mechanics" by J.J. Sakurai and Jim Napolitano: This book is another widely used undergraduate text that offers a more modern and rigorous treatment of quantum mechanics. It delves deeper into mathematical formalism and covers advanced topics such as scattering theory and relativistic quantum mechanics. Sakurai's approach is known for its clarity and mathematical elegance.
"Quantum Mechanics: Concepts and Applications" by Nouredine Zettili: This book is known for its comprehensive coverage of quantum mechanics, including both foundational concepts and applications in various fields. It strikes a balance between mathematical rigor and intuitive explanations, making it suitable for advanced undergraduate and graduate students.
If you are new to quantum mechanics, starting with Griffiths' book is a good idea to build a solid foundation. Once you grasp the basics, you can consider delving into Sakurai's or Zettili's book for a deeper understanding or to explore specific topics in more detail. However, it's not necessary to read all three books unless you want to gain different perspectives or have a more thorough understanding.
Remember that quantum mechanics is a complex subject, and it's often beneficial to consult multiple sources to gain a more comprehensive understanding. Additionally, working through exercises and problems in any of these books is crucial for reinforcing your understanding and developing problem-solving skills in quantum mechanics.