Aharonov-Bohm Effect.- Aharonov-Casher Effect.- Algebraic Quantum Mechanics.- Angular Momentum.- Anyons.- Aspect Experiment.- Asymptotic Freedom.- Atomic Model.- Atomic Models, J.J. Thomson\'s \"Plum Pudding\" Model.- Atomic Models, Nagaoka\'s Saturnian Model.- Bell\'s Theorem.- Berry\'s Phase.- Black Body.- Black-Body Radiation.- Bohm Interpretation of Quantum Mechanics.- Bohmian Mechanics.- Bohm\'s Approach to the EPR Paradox.- Bohr\'s Atomic Model.- Bohr-Kramers-Slater Theory.- Born Rule and its Interpretation.- Bose-Einstein Condensation.- Bose-Einstein Statistics.- Bremsstrahlung.- Brownian Motion.- Bub-Clifton Theorem.- Casimir Effect.- Cathode Rays.- Causal Inference and EPR.- Clauser-Horne-Shimony-Holt (CHSH) - Theorem.- Cluster States.- Coherent States.- Color Charge Degree of Freedom in Particle Physics.- Complementarity Principle.- Complex-Conjugate Number.- Compton Experiment (or Compton Effect).- Consistent Histories.- Copenhagen Interpretation.- Correlations in Quantum Mechanics.- Correspondence Principle.- Counterfactuals in Quantum Mechanics.- Covariance.- CPT Theorem.- Creation and Annihilation Operators.- Creation and Detection of Entanglement.- Davisson-Germer Experiment.- De Broglie Wavelength (? = h/p).- Decay.- Decoherence.- Degeneracy.- Delayed-Choice Experiments.- Density Matrix.- Density Operator.- Diffeomorphism Invariance.- Dirac Equation.- Dirac Notation.- Double-Slit Experiment (or Two-Slit Experiment).- Effect.- Ehrenfest Theorems.- Eigenstates, Eigenvalues.- Einstein Locality.- Electron Interferometry.- Electrons.- Ensembles in Quantum Mechanics.- Entanglement.- Entanglement Purification and Distillation.- Entropy of Entanglement.- EPR-Problem (Einstein-Podolsky-Rosen Problem).- Errors and Paradoxes in Quantum Mechanics.- Exclusion Principle (or Pauli Exclusion Principle).- Experimental Observation of Decoherence.- Fermi-Dirac Statistics.- Feynman Diagrams.- Fine-Structure Constant.- Franck-Hertz Experiment.- Functional Integration; Path Integrals.- Gauge Symmetry.- Generalizations of Quantum Statistics.- GHZ (Greenberger-Horne-Zeilinger) Theorem and GHZ States.- Gleason\'s Theorem.- Grover\'s Algorithm.- GRW Theory (Ghirardi, Rimini, Weber Model of Quantum Mechanics).- Hamiltonian Operator.- Hardy Paradox.- Heisenberg Microscope.- Heisenberg Picture.- Heisenberg Uncertainty Relation (Indeterminacy Relations).- Hermitian Operator.- Hidden Variables.- Hidden-Variables Models of Quantum Mechanics (Noncontextual and Contextual).- Hilbert Space.- Holism in Quantum Mechanics.- Identity of Quanta.- Identity Operator.- Ignorance Interpretation of Quantum Mechanics.- Indeterminacy Relations.- Indeterminism and Determinism in Quantum Mechanics.- Indistinguishability.- Interaction-Free Measurements (Elitzur-Vaidman, EV IFM).- Interpretations of Quantum Mechanics.- Invariance.- Ithaca Interpretation of Quantum Mechanics.- jj-Coupling.- Kaluza-Klein Theory.- Kochen-Specker Theorem.- Landés g-factor and g-formula.- Large-Angle Scattering.- Light Quantum.- Locality.- Loopholes in Experiments.- Lüders Rule.- Mach-Zehnder Interferometer.- Magnetic Resonance.- Many Worlds Interpretation of Quantum Mechanics.- Matrix Mechanics.- Matter Waves.- Measurement Problem.- Measurement Theory.- Mesoscopic Quantum Phenomena.- Metaphysics of Quantum Mechanics.- Mixed State.- Mixing and Oscillations of Particles.- Modal Interpretations of Quantum Mechanics.- Neutron Interferometry.- No-Cloning Theorem.- Nonlocality.- Nuclear Fission.- Nuclear Models.- Objectification.- Objective Quantum Probabilities.- Observable.- One- and Two-Photon Interference.- Operational Quantum Mechanics, Quantum Axiomatics and Quantum Structures.- Operator.- Orthodox Interpretation of Quantum Mechanics.- Orthonormal Basis.- Parity.- Particle Physics.- Particle Tracks.- Parton Model.- Paschen-Back Effect.- Pauli Exclusion Principle.- Pauli Spin Matrices.- Photoelectric Effect.- Photon.- Pilot Waves.- Planck\'s Constant h.- POVM (Positive Operator Value Measure