Researchers are exploring the use of terahertz spectroscopy to study and control quantum phenomena in various materials, including superconductors. The studies involve the use of light to manipulate and investigate the properties of these materials, with some focusing on iron-based superconductors and others on cuprate superconductivity. The specific techniques and findings vary, with some studies examining Higgs modes, quantum coherence, and magnon multiplication, while others investigate light-induced enhancement of superconductivity and unique luminescence properties.