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Quantum Mechanics Notes — a complete quantum mechanics study system in your pocket. WHAT THIS IS An original, systematic library of quantum mechanics study notes — 47 articles organized into six parts along a natural learning path: 1. Quantum Behavior & Foundations — double-slit interference, wave-particle duality, uncertainty relations 2. Formalism & Mathematical Structure — Hilbert space, operators, the Schrödinger equation, path integrals 3. Many Bodies, Symmetry & Condensed Matter — identical particles, atoms and molecules, band theory, superconductivity, the quantum Hall effect 4. Quantum Information & Quantum Optics — entanglement, teleportation, quantum computing, field quantization 5. Relativistic Theory & Frontiers — the Klein-Gordon equation, the Dirac equation, quantum field theory, quantum gravity 6. Gems & Minerals Special Topics — crystal field theory, color centers, spectroscopy, first-principles methods HIGHLIGHTS · 6,200+ LaTeX formulas individually typeset — a reading experience close to a printed textbook · 92 numerical simulation figures (interference buildup, band structure, decoherence dynamics, and more), each backed by a viewable Python script · Everything works fully offline — no network needed, perfect for commutes, labs, and exam week · Built-in LaTeX renderer: type or paste any formula and see it rendered instantly, with full-screen display · Import your own Markdown notes and photo albums, and bind them to the articles you are reading · Reading progress, table-of-contents navigation, dark and light themes PLEASE NOTE The notes are written in Simplified Chinese, and the app interface is in Chinese as well. Formulas, figures, and structure can be followed without Chinese, but the prose is not translated. COMPLETELY FREE The app is free with no ads, no paywalls, and no account required. "Support the Author" in Settings is an optional tip that unlocks nothing — all 47 articles are free for everyone, forever. WHO IT'S FOR Physics students preparing for exams or graduate-school entrance tests, researchers who need a quick formula reference, and self-learners who want a systematic understanding of quantum mechanics. Each article's mathematical level is labeled (L1 conceptual to L4 frontier), so you can choose your own starting point.