Introduction to the strange and beautiful world of quantum 7
10 for all of us who are bad at physics
Prologue 15
Starting with the "Quantum Mechanics" section, 19

Lesson 1: Systems and Experiment 23
Lecture 2: Quantum States 61
Lecture 3: Principles of Quantum Mechanics 81
4th Quarter Time Change 129
Lecture 5: Uncertainty and Time Dependence 171
Combination of the Six Powers 195
Lesson 7: Entanglement Learn More 235
8. Particles and Waves 295
Lecture 9 Particle Dynamics 339
Harmonic Oscillator 383

Appendix Spin Brief Summary 425
Translator's Note: The Ultimate Weapon of Human Intelligence: Quantum Mechanics 433
Search 437

The Essentials of Quantum Mechanics, Directly from the Founder of String Theory

Leonard Susskind, a professor of physics at Stanford University, is a pioneer in string theory, which is gaining attention as a candidate for a grand unified theory.
He has been a professor at Stanford University since 1973, contributing to various fields such as quantum optics, elementary particle physics, condensed matter physics, and the theory of gravity.
In particular, he was a close friend and rival of the recently deceased Stephen Hawking, and was also the protagonist of the 'Black Hole War', which established the principle of black hole complementarity and the theory of holography against him.
Born in 1940, he is a physicist who, at the age of 79, is still leading cutting-edge research and public education.
Last year, he heated up the academic world by publishing two consecutive papers that comprehensively studied wormholes, quantum teleportation, and the EPR paradox, suggesting the possibility of integrating quantum mechanics and general relativity.
As author Susskind puts it, the goal of this book is “not to hide the absurdly strange logic of quantum mechanics, but rather to bring it into the light of the world.”
The author boldly omits the history of quantum mechanics and other topics covered in most quantum mechanics textbooks, and begins the process of “rewiring” the reader’s “intuitive circuit” to fit quantum mechanics from the introduction.
The first half explains the crucial reasons why quantum mechanics differs from classical mechanics, and covers new logic and tools for understanding quantum mechanics, such as spin, qubits, the uncertainty principle, and linear algebra.
In the second half, the logic of quantum mechanics is applied to particles and harmonic oscillators, which were the objects of study in classical mechanics, to discover hidden laws of nature.
In addition, two chapters (Lectures 6 and 7), which account for approximately 20 percent of the entire text, cover entanglement, a core concept in quantum information science.
And, through practice problems throughout the book, readers are given the opportunity to solve quantum mechanics problems using mathematics and gain a firsthand understanding.
While studying this book, you will have the unique experience of overcoming our innate 'physical weaknesses' and crossing the 'quantum gap'.
Meanwhile, Professor Jongpil Lee of Konkuk University, who has translated and published other books by Susskind, including 『Black Hole Wars』 and 『The Essentials of Physics: Classical Mechanics』, has translated the book and provided a concise and accurate Korean explanation.
Just as I have personally given lectures explaining the "Classical Mechanics" section in "Mathematics for Adults" and "Jongpil Lee's Physics Essentials Special Lecture," several offline special lectures by the translator are scheduled for this "Quantum Mechanics" section immediately after its publication.
In addition, a collection of practice problems, 『Physics Essentials Solutions: Quantum Mechanics』, produced by Science Books and supervised by Professor Jongpil Lee, will be provided as a gift to all readers who purchase the book.
The solutions enable readers to practice quantum mechanics more effectively through the book's practice problems.
As it is a quantum version of Leonard Susskind's physics classic, with free YouTube lectures and practice problem solutions, and Professor Jongpil Lee personally lecturing for Korean readers, it is the best book for everyone: from beginners who know nothing about quantum mechanics to those who want to challenge quantum mechanics, the next step after "Classical Mechanics," those who are tired of existing explanations that seem to conflict between classical mechanics and quantum mechanics, and college students and office workers who want to challenge quantum mechanics as a new common sense and practical basic study in the 21st century.