Explore the intricacies of dissipative many-body quantum systems and hidden time-reversal symmetry in this comprehensive lecture by Aashish Clerk. Delivered as part of the "Periodically and Quasi-periodically Driven Complex Systems" program at the International Centre for Theoretical Sciences, this hour-long talk delves into advanced topics in quantum physics. Gain insights into the interplay between closed quantum systems with time-dependent Hamiltonians, open quantum systems, and gauge theory of coupling between matter and radiation. Discover how these fields contribute to our understanding of terahertz and infrared driven quantum matter, shaken optical lattices, Floquet time crystals, and localization-delocalization physics in quasi-periodically driven systems. Enhance your knowledge of complex quantum phenomena and their applications in cutting-edge research and quantum simulation experiments.