Contents:1. Basic concepts of statistical optics2. Spatial and temporal coherence. Coherent modes, photon number per mode3. Intensity fluctuations and Hanbury Brown and Twiss experiment4. Interaction between atom and light (semiclassical description)5. Quantization of the electromagnetic field6. Quantum operators and quantum states7. Heisenberg and Schrödinger pictures8. Polarization in quantum optics9. Nonlinear optical effects for producing nonclassical light10. Parametric down-conversion and four-wave mixing, biphotons, squeezed light11. Single-photon states and single-photon emitters12. Entanglement and Bell’s inequality violation