Coherent States: Quantum Optics

This lecture introduces coherent states in quantum optics, which are eigenstates of the annihilation operator. The lecture covers the definition of coherent states, their properties, and their relation to Fock states. It also discusses the displacement operator, the Baker-Campbell-Hausdorff formula, and the dynamics introduced by Schroedinger's equation. The lecture concludes with the time evolution of Fock states and coherent states, emphasizing their usefulness in quantum metrology.