Explore the fascinating world of quantum phases of matter in this comprehensive lecture by Harvard University professor Subir Sachdev. Delve into a survey of experiments covering topics such as ordinary metals, Fermi surfaces, insulators, and symmetry breaking. Examine the intricacies of copper lattices, spin waves, and critical points while gaining insights into long-range entanglement and relativistic fields. Investigate various lattice structures, including square and triangular, and learn about valence bond insulators, resonating variance bond states, and wave functions. Discover the applications of neutron scattering and spinon gaps in this in-depth exploration of quantum physics, presented as part of a joint course between the Institute for Advanced Study and the Tata Institute of Fundamental Research.